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A free, open-source Chrome DevTools extension for testing APIs — capture, inspect, edit, and replay HTTP requests without an external proxy, plus a quick header and secrets audit.
FreeOpen source
What to know▼
How it works
A Chrome DevTools extension that captures, inspects, edits, and replays HTTP/HTTPS requests without an external proxy, plus a Quick Security Check that audits headers and flags secrets or PII.
What's different
Works without needing to route traffic through an external proxy, unlike typical API testing setups.
Pricing
Free and open-source.
Best for
Developers testing API security directly inside Chrome DevTools.
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An open-source SDK that unifies multiple payment providers (Paystack, Flutterwave, Razorpay, Monnify, Interswitch) behind one API, instead of integrating each provider separately across web, mobile, and no-code platforms.
FreeOpen source
What to know▼
How it works
Native SDKs for React, Vue, Svelte, React Native, Flutter, iOS, Android, plus no-code plugins for Shopify, WordPress, Webflow, Wix, Squarespace.
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An open-source Python framework that auto-generates a REST API, admin back-office, and React CRUD UI from your data models, for developers building internal tools locally.
Works offlineOpen source
What to know▼
How it works
define data models once in Python; generates API, admin panel, and UI automatically
What's different
open source, local-first, data stays on your infrastructure
Best for
developers building CRUD apps without hand-building each layer
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Bundles five small free-tier developer APIs (WHOIS, company lookup, email validation, geolocation, sanctions screening) as a cheaper alternative to separate paid subscriptions.
Watch out · Built with Cursor AI; open source on GitHub.
FreeOpen source
What to know▼
How it works
Bundles five production APIs: Domain WHOIS via RDAP, Company Info from Wikipedia/Wikidata, Email Validator with MX+SMTP, IP Geolocation with dual-source fallback, and a Sanctions Screener with 20K+ OFAC/UN entities.
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A self-hosted agent that lets you talk to any REST API in plain English through its MCP layer, using your own LLM such as Ollama — built for developers.
Open sourceSelf-hosted
What to know▼
How it works
A self-hosted agent with an MCP layer that lets you talk to any REST API in natural language, using your own LLM (e.g. Ollama) instead of a hosted one.
What's different
Bring-your-own-LLM and fully self-hosted, so API credentials and data stay under your control.
Best for
Developers who want to interact with REST APIs conversationally while keeping their own LLM and data ownership.
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An edge-native transactional email service for Next.js/Vercel/Cloudflare apps, with a self-hosted open-source option, for developers who don't want to run their own email infrastructure.
Open sourceSelf-hosted
What to know▼
How it works
An edge-native transactional email service for Next.js, Vercel and Cloudflare Workers, with an open-source self-host option.
What's different
Runs at the edge alongside the deploy rather than as a separate hosted email service, and can be self-hosted.
Best for
Developers on Next.js/Vercel/Cloudflare who want transactional email without running their own infrastructure.
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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.
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Packs an entire web app or documentation site into a single offline ZIP file that runs without breaking on JS/CORS restrictions, unlike typical offline export formats.
Works offlineOpen source
What to know▼
How it works
Maps a ZIP to memory and spins up a local HTTP server so the packed app 'thinks' it's online
What's different
Open source, avoids CORS breakage that plagues other offline formats
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Self-hosted, open-source REST API that exposes MyAnimeList data through 70+ read-only endpoints, requiring no database or API key.
Open sourceSelf-hosted
What to know▼
How it works
Exposes public MyAnimeList data through 70+ read-only JSON REST API endpoints covering anime, manga, characters, users, rankings, seasons, reviews, and recommendations; written in Go, runs as a single binary with no database, API key, OAuth flow, or MyAnimeList developer credentials required.
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A Python SDK for scripting multi-agent coding workflows, letting different AI coding agents implement, review, and compete on tasks in isolated git worktrees.
Open source
What to know▼
How it works
Lets developers script the full development process in Python so agents like Claude Code and Codex implement independently, review one another, revise, run neutral tests, compete, and safely apply the winner, each working in an isolated Git worktree.
What's different
Open source, includes 40 multi-agent LLM paper workflows.
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An open-source MCP server that lets Claude answer read-only questions about your WooCommerce store — products, stock, orders, sales — via the official REST APIs; a developer tool to set up, not an end-user app.
Open source
What to know▼
How it works
An open-source MCP server that gives Claude or any MCP client read-only answers about a WordPress + WooCommerce store — products, stock, recent orders, sales reports and blog posts — via the official REST APIs with read keys.
What's different
Read-only by design: no writes and no plugin installs, just the official REST APIs.
Pricing
Open-source (free to self-host).
Best for
Developers setting up Claude or another MCP client to answer questions about their WooCommerce store.
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An open-source framework for developers and integrators to build custom business communication apps like auto-attendants and fax-to-email — a toolkit, not ready-to-use software.
Open source
What to know▼
How it works
An open-source communications framework that lets developers build custom communication applications such as auto attendants, fax-to-email and click-to-call, with custom business logic controlling incoming and outgoing communication.
What's different
Serves as a common server-side backend for CTI-related projects rather than a ready-to-use application.
Best for
Developers and integrators building custom telephony or communication applications.
