Open-source tools — I'd rather stay anonymous

28 match your filters — 27 of them answered our check today.

Watching this group for 19 days · how we check

This week7 new arrivals1 stopped answering

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Developers6Students1

Toolport

Live

A local gateway that lets every AI coding client share one set of MCP server connections instead of configuring each tool separately, cutting how many tools your agent has to load.

FreeNo sign-upWorks offlineOpen source
What to know▼
How it works
A local-first, open-source gateway. You set up and authenticate each MCP server once, and every connected AI client — Claude, Cursor, VS Code, Codex — shares that same connection instead of you configuring it per tool.
What's different
Claims up to 91% less tool-token overhead by giving an agent a handful of meta-tools instead of loading hundreds of individual tool definitions; API keys stay in the OS keychain.
Pricing
Free, open source, no sign-up.
Best for
Developers running multiple AI coding clients against the same set of MCP servers who don't want to re-authenticate each one separately.
Watch out
The '91% overhead cut' figure is the product's own claim; we haven't independently benchmarked it.

Watched for 19 days · last checked 1d ago

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FreeCustom.Email

Live

Instant, no-signup temporary email aliases with rotating domains to dodge blacklists, plus a public API for developers who want to build it into their own workflows.

FreeNo sign-upData stays with youOpen source
What to know▼
How it works
Creates custom, instant temporary email aliases (any inbox name) without sign-up, receiving emails in real-time from multiple rotating domains to avoid blacklists; also offers a public API and open-source frontend.
What's different
Rotating domains to avoid blacklists, plus no popups, timers, or tracking, unlike traditional temp mail tools.
Pricing
Free.
Best for
People needing disposable email for sign-up verifications or testing, and developers who want to build disposable email into their own workflows via the API.

Watched for 13 days · last checked 7d ago

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smtp-probe

Live

An open-source CLI that checks SPF/DKIM/DMARC/MX records, verifies addresses via SMTP, and flags disposable/role-based emails, for developers validating deliverability before sending.

Open source
What to know▼
How it works
DNS health scoring, SMTP RCPT TO verification, domain typo correction, 29 RBL blacklist scans, ~74k disposable domain detection; includes REST API.
Pricing
Free demo available.

Watched for 1 day · last checked today

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AllergyTJ

Live

A free, open-source pollen and air-quality tracker for 30 Tajikistan cities, combining a seasonal allergen calendar with live weather and satellite air data, delivered in Tajik, Russian and English.

FreeNo sign-upOpen sourceNo tracking
What to know▼
How it works
Tracks pollen risk and air quality across 30 Tajikistan cities using an inference-based model: a seasonal calendar for 9 allergen species, adjusted with live Open-Meteo weather and Copernicus CAMS satellite air-quality data, with a 5-day forecast and personal allergen profiles.
What's different
Free, open source, no sign-up or tracking, and available in Tajik, Russian and English with Telegram updates.
Pricing
Free.
Best for
People in Tajikistan managing seasonal allergies who want localized forecasts.
Watch out
Pollen risk is modeled/inferred from weather and satellite data, not measured directly.

Watched for 11 days · last checked 5d ago

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SDKCraft

Live

A free, open-source CLI and web tool that turns an OpenAPI spec into a ready-to-use client SDK in TypeScript, Python, Go, Dart or Java — a developer tool, not an API service.

FreeNo sign-upOpen source
What to know▼
How it works
Turns an OpenAPI spec into a production-ready SDK in TypeScript, Python, Go, Dart or Java, with a code preview, ZIP download, a CLI (npx sdkcraft), API change detection, and an AI documentation generator.
What's different
Free, open source and requires no signup.
Pricing
Free and open source.
Best for
Developers who need a client SDK generated from an existing OpenAPI spec instead of writing one by hand.

Watched for 12 days · last checked 6d ago

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Maptoolkit.org - free vector map server

Live

Lets developers add customizable vector maps to their projects instead of paying for commercial map APIs with sign-ups and rate limits.

FreeNo sign-upOpen source
What to know▼
How it works
Vector tile server built on OpenStreetMap and MapLibre with 3D terrain and hillshading.
Pricing
free, no API keys, no request limits

First seen today · last checked today

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YAML2JSON

Live

Converts YAML to JSON and back entirely in your browser, including multi-document Kubernetes manifests, with line-numbered parse errors, your config never leaves the browser.

Domain registered 21 days ago

FreeNo sign-upWorks offlineData stays with you
What to know▼
How it works
Converts YAML to JSON and back entirely in the browser, including multi-document files like Kubernetes manifests, with line-numbered parse errors.
What's different
Runs offline once loaded and your config never leaves the browser; the conversion core is open source.
Pricing
Free, no signup.
Best for
Developers who need to convert Kubernetes manifests or other YAML/JSON files without uploading them anywhere.

Watched for 13 days · last checked 7d ago

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Markhand

Live

A free, open-source tool for drawing and practicing your signature with custom pens and guides, then exporting it as PNG or SVG. General-purpose, not a developer tool.

FreeNo sign-upOpen sourceCan export my data
What to know▼
How it works
A tool for drawing and practicing your signature with customizable pens and guides, then exporting it as PNG or SVG.
Pricing
Free, open source, no sign-up required.
Best for
Anyone who wants to design or practice a personal signature and export it as an image.

Watched for 16 days · last checked 1d ago

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Fast PDF Tools

Live

Merges, splits, compresses, and converts PDFs entirely in your browser, so files never get uploaded to a server.

Domain registered 8 months ago

FreeNo sign-upNothing to installData stays with you
What to know▼
How it works
Runs PDF/image tools client-side in JavaScript
What's different
Nothing leaves your device, unlike most free PDF tools
Pricing
Free, open source

Watched for 5 days · last checked 3d ago

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JSON AI Studio

Live

A free, open-source AI tool that edits JSON files from plain-English instructions instead of hand-written syntax, with diff review and version rollback.

FreeNo sign-upOpen source
What to know▼
How it works
An open-source AI workspace for editing JSON files: describe changes in plain English, review every edit as a diff, and roll back using full version history.
What's different
Diff review and full version rollback for every AI-made edit instead of blind overwrites.
Pricing
Free, no signup required.
Best for
Developers and teams who need to edit JSON without hand-writing syntax.

Watched for 13 days · last checked 2d ago

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Blastmates

Live

A free, open-source multiplayer bomb-arena game you play instantly in the browser with up to 8 friends — no download or account, and you can self-host it from the GitHub source.

Domain registered 1 month ago

FreeNo sign-upNothing to installOpen source
What to know▼
How it works
A multiplayer bomb-arena game that runs in the browser: share a room link, up to 8 friends join, drop bombs to blow up bricks, and be the last one standing. Bots fill empty slots and sudden death keeps rounds short.
What's different
Free, open-source, and playable instantly with no download or account; the full source is on GitHub to fork or self-host.
Pricing
Free.
Best for
Friends who want to jump into a quick multiplayer game together with no signup or install.

Watched for 11 days · last checked 5d ago

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Debt vs. Invest Calculator

Live

A free, open-source calculator that tells you whether paying off debt or investing wins after taxes, using 2026 U.S. federal and state tax rules instead of a simple pre-tax rate comparison.

FreeNo sign-upOpen source
What to know▼
How it works
Applies 2026 federal brackets, NIIT, and state tax treatment to compare options like a HYSA, T-Bills, stocks, or IRAs against paying off a car or student loan, with shareable links.
What's different
Compares after-tax returns rather than the pre-tax rate comparison most calculators use.
Pricing
Free, open source, no signup.
Best for
anyone deciding whether to pay off a loan or invest extra money.

Watched for 11 days · last checked 5d ago

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Setyenv Wordpress Manage Automate and IA

Live

A self-hosted WordPress plugin combining a visual workflow automation engine with an open-source AI agent that builds workflows and asks before acting, using your own LLM API keys.

Domain registered 2 months ago

FreeNo sign-upData stays with youOpen source
What to know▼
How it works
A low-code workflow builder plus an open-source AI agent and local executor run inside WordPress, with no SaaS component and data staying on your own server.
Pricing
Agent and executor are free; one license covers both paid plugins for the rest of the stack.
Best for
WordPress site owners who want automation without sending data to a third-party SaaS.

Watched for 11 days · last checked 8d ago

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Capsule - Easy File Transfers

Live

Encrypted, self-destructing file transfers via a memorable three-word link, usable from the browser, terminal or Android app; open source and self-hostable, aimed at technical users rather than a dedicated mobile app.

Open sourceSelf-hosted
What to know▼
How it works
Upload a file from the browser, terminal, or Android app and share a link built from three readable words; the file is end-to-end encrypted on-device using the age format with a BIP39 mnemonic passphrase, and deleted from the server an hour later.
What's different
True end-to-end encryption across all clients (web, CLI, Android) with fully interoperable encrypt/decrypt between them, plus open source and self-hostable.
Best for
Technical users moving a file between devices or people who want it gone after an hour, rather than a permanent hosted link.

Watched for 17 days · last checked 1d ago

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Screenshot beautifier

Live

Free browser tool that adds device frames, gradients, and shadows to screenshots without uploading them anywhere.

FreeNo sign-upOpen sourceCan export my data
What to know▼
How it works
Runs entirely in-browser via html2canvas, no server uploads
What's different
100% client-side processing, open source
Pricing
free, no signup

Watched for 3 days · last checked 2d ago

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OWOX Model Canvas

Live

A free, open-source visual canvas for drawing data models — tables and joins — and exporting them to Google's Open Knowledge Format, for data and analytics engineers who want a schema their text-to-SQL tools can read.

FreeOpen sourceCan export my data
What to know▼
How it works
A visual canvas for drawing data model tables and joins, or letting AI draft them, then exporting to Google's Open Knowledge Format so an LLM-based text-to-SQL tool can read your schema.
What's different
Google only shipped a viewer for OKF; this is the authoring canvas, with sample models from GA4, Stack Overflow and Bitcoin.
Pricing
Free and open source, no sign-in required.
Best for
Data and analytics engineers who want a portable, git-friendly schema for text-to-SQL tools.

Watched for 16 days · last checked 10d ago

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Country Filter for X (Twitter)

Live

A browser extension that hides X (Twitter) posts from countries you pick, detecting location locally with no external servers or sign-up. A niche personal timeline filter, not a developer tool.

No sign-upWorks offlineOpen sourceNo tracking
What to know▼
How it works
A browser extension where you check countries in a popup and posts from those countries disappear from your X For You feed, Following feed, search, and reply threads; detection runs locally using known accounts, country/city keywords, post language, and public profile location.
What's different
No sign-up, no tracking, and no external servers — settings and detection stay in your browser; open source (MIT).
Best for
X users who want to filter their timeline by country without sending data to a third-party server.

Watched for 17 days · last checked 1d ago

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Grid Maker

Live

A free, open-source grid tool for artists — perspective grids, composition overlays, an art projector, paint-by-number and an Instagram grid splitter — kept free where other tools paywall them.

FreeNo sign-upOpen source
What to know▼
How it works
A free, open-source grid tool for artists offering 9 grid types, including an Art Projector, Paint by Number, and an Instagram Grid Splitter.
What's different
Keeps perspective grids, composition overlays and diagonal lines free, where competitors paywall them.
Pricing
Free, MIT licensed.
Best for
Artists who want grid tools without paying for features other apps lock behind a paywall.

Watched for 14 days · last checked 2d ago

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GitWicket

Live

Turns your GitHub commit history into an ICC-style cricket player card with a rating and role, purely for fun - a novelty for developers who grew up on cricket games, not real analytics.

No sign-upOpen source
What to know▼
How it works
Turns your GitHub commit history and activity into an ICC-style cricket player card with an overall rating, a role (Batter, Bowler, All-Rounder, Wicket-Keeper, or Captain), six attribute scores, and a scouting report, generated from your real stats by entering just a username.
What's different
No sign-up required, open source, and lets you download the card as a PNG or share it directly to X, LinkedIn, or WhatsApp.
Pricing
Free.
Best for
Developers who grew up on cricket video games and are curious what their commit history says about them, as a novelty rather than analytics.

Watched for 15 days · last checked 2d ago

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InteractivePrimer.com

Live

A free, open-source site of interactive step-by-step lessons in math, computer science and physics, with animations and quizzes. Built for self-directed students, not developers, despite the compsci content.

FreeNo sign-upOpen sourceNo ads
What to know▼
How it works
Free, open-source interactive lessons in math, computer science, and physics, structured as one knowledge tree you progress through at your own pace, with animations, randomized quizzes, and progress tracking.
What's different
No sign-up and no ads required to use it.
Pricing
Free and open-source.
Best for
Self-directed students learning math, computer science, or physics on their own.

Watched for 16 days · last checked 8d ago

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WireDog VPN

Live

A VPN with only US-based, RAM-only servers, open-source code you can audit, and anonymous sign-up by number, payable in cash or Monero. A general consumer privacy product, not a developer tool.

Open sourceNo tracking
What to know▼
How it works
A VPN running only on US-based, RAM-only servers (making log retention technically impossible), with open-source code you can audit and account signup by a 16-digit number instead of email.
What's different
Anonymous accounts and payment by mail-in cash, prepaid vouchers, or Monero, plus open-source code for independent auditing.
Best for
US-based users who want their VPN traffic and account to stay off American-soil data requirements without disclosing identity.

Watched for 17 days · last checked 1d ago

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ExifErase

Not responding

Strips hidden GPS and camera metadata from photos entirely in your browser before you share them, with no uploads.

No sign-upOpen sourceNo tracking
What to know▼
How it works
Client-side processing using the Canvas API; supports JPEG, PNG, WebP, and HEIC
Pricing
Open source

Watched for 4 days · last checked today

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gitspark

Live

Finds real beginner-friendly open-source GitHub issues and explains them with AI, no account needed.

No sign-upNothing to installOpen source
What to know▼
How it works
Fetches beginner-friendly GitHub issues live, filtered by language and contribution status, and explains them with AI-powered explanations; issues can be saved locally.
Watch out
No signup, no backend, no account needed.

Watched for 2 days · last checked 2d ago

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Dynamic Feed

Live

A single API call returns live, cryptographically signed data across 87 sources so AI agents and software can verify what they're consuming — a developer-facing trust layer, not a consumer app.

No sign-upOpen source
What to know▼
How it works
A single keyless API call returns structured JSON for 87 live tools across 19 verticals; each datapoint carries its source, licence, timestamp and an Ed25519 signature, optionally Bitcoin-anchored.
What's different
Data is cryptographically verifiable rather than just scraped and cited, and it works without signup or an API key via an MCP endpoint or batch POST.
Best for
Developers building AI agents or software that need to independently verify the live data they consume.

Watched for 16 days · last checked 1d ago

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live.tips

Live

A QR-code digital tip jar that lets live performers collect card and digital wallet tips directly into their own Stripe account, shown on a live on-stage display.

Domain registered 6 months ago

No sign-upOpen source
What to know▼
How it works
A QR code lets audiences send card and digital wallet tips directly to a performer's own Stripe account, with a live 3D jar display showing names and messages on stage.
What's different
No platform cut, no signup, open source, and keys never leave the device.

Watched for 9 days · last checked 3d ago

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There's a Free Tool For That

Live

A directory of 300+ free, open-source alternatives to popular paid software, searchable and filterable.

FreeNo sign-upOpen source
What to know▼
How it works
A searchable, filterable directory of 300+ free, open-source alternatives to popular paid software, with the ability to save favorites.
Pricing
Free, no sign-up required.

Watched for 7 days · last checked 5d ago

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Stickblade Arena

Live

Two LLMs control stick-figure fighters with swords in a real physics simulator and you vote on who fought better — a playful but genuine benchmark for comparing model tactical reasoning.

FreeNo sign-upOpen source
What to know▼
How it works
Two LLMs control 2D stick-figure fighters in a real physics simulator, each receiving a JSON snapshot of the world every 3 seconds and choosing an action within 15 seconds; users pick the weapon and vote blind on who fought better, with per-weapon, per-zone Elo rankings.
What's different
Server-side randomization of which ragdoll is which color keeps voting unbiased, turning a joke concept into a tactical-reasoning benchmark.
Pricing
Free, no account required, open source.
Best for
People interested in comparing how different LLMs plan multi-turn tactics, in a more entertaining format than typical chatbot arenas.

Watched for 16 days · last checked 10d ago

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NexavoTools

Live

40 free in-browser tools (PDF compress, convert, OCR, SEO checks) that never upload files, open-source, in 6 languages.

FreeNo sign-upData stays with youOpen source
What to know▼
How it works
40 tools for compressing PDFs and images, converting files, OCR, and SEO checks, all running in the browser with no upload, handling files up to 1GB.
What's different
Open-source (AGPL) and available in 6 languages.
Pricing
Free, ad-supported.
Best for
People wanting private, no-signup file utilities.

Watched for 2 days · last checked 2d ago

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