api
A Man-in-the-Middle proxy written in Rust. Intercept, inspect, and modify HTTP/HTTPS traffic with Lua scripting, a TUI, and a web interface.
A programmable MITM proxy that intercepts HTTP/HTTPS traffic so you don't have to guess what your app is doing. Forward & reverse modes, TLS interception, TUI, terminal, and web GUI.
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Tool to guess CPE name based on common software name.
CPE Guesser is a command-line tool or web service designed to guess the CPE name based on one or more keywords. The resulting CPE can then be used with tools like cve-search or vulnerability-lookup to perform actual searches using CPE names.
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Extract Dominant Colors from Images. Go CLI, REST API & JavaScript Library.
Extract dominant colors from images using k-means clustering. A fast, cross-platform CLI tool that extracts dominant colors from images using k-means clustering.
Vite plugin that reimplements the Next.js API surface — deploy anywhere.
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Turn GitHub Copilot into OpenAI/Anthropic API compatible server. Usable with Claude Code!
A reverse-engineered proxy for the GitHub Copilot API that exposes it as an OpenAI and Anthropic compatible service. This allows you to use GitHub Copilot with any tool that supports the OpenAI Chat Completions API or the Anthropic Messages API, including to power Claude Code.
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A simple HTTP Request & Response Service. HTTP Request & Response Service, written in Python + Flask.
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Passive API Contract Monitoring for PHP 8.3+. Detects breaking changes, json schema drift, and unexpected structural modifications in third-party REST APIs via probabilistic inference.
Passive API Contract Monitoring for strictly typed PHP 8.3+.
Sentinel silently monitors the JSON payloads returning from the third-party APIs you consume, automatically infers their structural JSON Schema, and detects when they change unexpectedly (drift).
the forever free, adless and open source chess server ♞.
Lila (li[chess in sca]la) is a free online chess game server focused on realtime gameplay and ease of use.
API mocking library for browser and Node.js. Industry standard API mocking for JavaScript.
Mock Service Worker is an API mocking library that allows you to write client-agnostic mocks and reuse them across any frameworks, tools, and environments.
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home of open source icons.
Iconify is an opensource library of icons - they also have an API which you can use to get the icon SVG.
AI Agents on a Private GenAI Stack.
♾️ Helix is a private GenAI stack for building AI agents with declarative pipelines, knowledge (RAG), API bindings, and first-class testing.
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High-fidelity image processing microservice. Features native HEIC ingestion, ICC color profile management (sRGB), Lanczos resampling, and hardware-accelerated AVIF encoding. Built for professional event photography workflows.
✉️ Open-Source Email API for Developers. Self-hosted Alternative to SES, Mailgun, SendGrid.
Hyvor Relay is a self-hosted, open-source email API for developers. It uses SMTP to send emails using your own infrastructure. It is designed to be simple to self-host, easy to manage and observe, and powerful enough to send millions of daily emails.
Automated API Testing From Live Traffic. Node.js SDK for capturing and replaying API calls made to/from your service.
The Node.js Tusk Drift SDK enables fast and deterministic API testing by capturing and replaying API calls made to/from your service. Automatically record real-world API calls, then replay them as tests using the Tusk CLI to find regressions. During replay, all outbound requests are intercepted with recorded data to ensure consistent behavior without side-effects.
Language-agnostic API mocking and testing utility.
mock is an API utility - it lets you:
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define API routes easily through API configuration files or through command-line parameters.
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use shells scripts as response handlers. Or any other type of program can act as response handlers.
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test your API - make assertions on whether an endpoint was requested.
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Version control for your data. Automerge is a local-first sync engine for multiplayer apps that works offline, prevents conflicts, and runs fast.
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Fetch Favicons from any website A free & simple API to get favicons from any website. Open-source, easy to use, and self-hostable.
⚙️ Convert HTML to Markdown. Even works with entire websites and can be extended through rules.
A robust html-to-markdown converter that transforms HTML (even entire websites) into clean, readable Markdown. It supports complex formatting, customizable options, and plugins for full control over the conversion process.
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Mock the APIs You Depend On. flexible, open source API mocking. A tool for mocking HTTP services.
WireMock supports several approaches for creating mock APIs - in code, via its REST API, as JSON files and by recording HTTP traffic proxied to another destination. WireMock has a rich matching system, allowing any part of an incoming request to be matched against complex and precise criteria. Responses of any complexity can be dynamically generated via the Handlebars based templating system. Finally, WireMock is easy to integrate into any workflow due to its numerous extension points and comprehensive APIs.
Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!
MCP (Model Context Protocol) is the emerging standard to define how AI agents communicate with applications. Using FastAPI-MCP, creating a secured MCP server to your application takes only 3 lines of code.
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A query language for your API.
GraphQL is an open‑source query language for APIs and a server‑side runtime. It provides a strongly‑typed schema to define relationships between data, making APIs more flexible and predictable. And it isn’t tied to a specific database or storage engine — it works with your existing code and data, making it easier to evolve APIs over time.
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WhatsApp HTTP API (REST API) that you can configure in a click! 3 engines: WEBJS (browser based), NOWEB (websocket nodejs), GOWS (websocket go).
WhatsApp HTTP API (REST API) that you can install on your own server and run in less than 5 minutes!
API Documentation for Python Projects.
pdoc auto-generates API documentation that follows your project's Python module hierarchy. It requires no configuration, has first-class support for type annotations, cross-links between identifiers, comes with an integrated live-reloading web server, and understands numpydoc or Google-style docstrings.
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A WordPress API for declaring and discovering plugin, theme, and core abilities in a human- and machine-readable way.
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API for generating static map images
docker-staticmaps is an open-source API for rendering static map images. Easily create maps with markers, polygons, circles, polylines or text, making it perfect for embedding map images on websites or apps. Comes with built-in rate limiting and image caching to optimize performance and protect against abuse.
KVM Management, Reimagined. Lightweight tool for managing linux virtual machines.
A single <11MB binary with a modern Web UI, CLI, and API for KVM. No XML. No bloat. Just VMs.
📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail
Postal is a complete and fully featured mail delivery platform for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers.
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Image Background Remover API. Open source image background removal model Remove backgrounds from images instantly with AI. Choose between local processing (free) or cloud API (best quality).
The Ultimate all-in social media automation (outreach) tool 🤖 . Social Media Outreach for automation experts.
GrowChief is an API based tool to automate your social media accounts such assending connection requests and follow-up messages.
Growchief is an open-source social media automation tool (aka social scraper). It allows you to create a workflow (step-by-step) for interacting with different accounts on social media, such as sending a connection request, following up with a message, and so on. We do not encourage spam (perfect for API/n8n automations).
Call all LLM APIs using the OpenAI format [Bedrock, Huggingface, VertexAI, TogetherAI, Azure, OpenAI, Groq etc.]
Python SDK, Proxy Server (LLM Gateway) to call 100+ LLM APIs in OpenAI format - [Bedrock, Azure, OpenAI, VertexAI, Cohere, Anthropic, Sagemaker, HuggingFace, Replicate, Groq]
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A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features.
curl is used in command lines or scripts to transfer data. curl is also libcurl, used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, medical devices, settop boxes, computer games, media players and is the Internet transfer engine for countless software applications in over twenty billion installations.
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client-driven hypermedia APIs. Use preloading to create fast and idiomatic client-driven REST APIs.
Vulcain is a brand new protocol using preload hints, Early Hints or HTTP/2 Server Push to create fast and idiomatic client-driven REST APIs.
An open source gateway server which you can put on top of any existing web API to instantly turn it into a Vulcain-compatible one is also provided! It supports hypermedia APIs but also any "legacy" API by documenting its relations using OpenAPI.
detect API auth weaknesses.
Autoswagger is a command-line tool designed to discover, parse, and test for unauthenticated endpoints using Swagger/OpenAPI documentation. It helps identify potential security issues in unprotected endpoints of APIs, such as PII leaks and common secret exposures.
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Integrate with any API. Simple, TypeSafe, Fast. Seamless Requests and Real-Time Connectivity. ⚡ Fetching and realtime data exchange framework.
Hyper Fetch is a framework that makes it easy to connect to any remote API. Using request based or real-time connection.
Hyper Fetch is unique fetching and realtime data-exchange framework meticulously crafted to prioritize simplicity and efficiency. Its typesafe design and user-friendly interface ensure a seamless integration experience, whether you're working on the browser or the server. Next-generation features streamlines architecture creation, grants access to the request lifecycle, and empowers rapid development of new components and functionalities, all while facilitating real-time data exchange.
Email Validation API. Block Fake Users. Stop Disposable Emails from Creating Spam Accounts.
UserCheck identifies and blocks fake email addresses. So you can focus on real users.
CallFS is an ultra-lightweight, high-performance REST API filesystem that provides precise Linux filesystem semantics over various backends including local filesystem, Amazon S3, and distributed peer networks
Visual REST API Builder. Build REST APIs Visually. Deploy in Rust.
Dyan is a self-hosted platform to build, test, and export blazing-fast APIs from your database using visual tools and JavaScript/Python logic.
a Pound-Shop BaaS.
Poor man's Backend-as-a-Service (BaaS), similar to Firebase/Supabase/Pocketbase.
Typesafe APIs Made Simple 🪄. Easy to build APIs that are end-to-end type-safe and adhere to OpenAPI standards.
oRPC is a powerful combination of RPC and OpenAPI, makes it easy to build APIs that are end-to-end type-safe and adhere to OpenAPI standards
A TypeScript server agnostic Whatsapp's Official API framework
Unified Backend Framework for APIs, Events and AI Agents.
Multi-language cloud functions runtime for API endpoints, background jobs, and agentic workflows using Motia Steps. Preview them in the Workbench, ship to zero-config infrastructure, and monitor in the Cloud.
Python app implementing a read-through cache for Bitwarden Secrets Manager (BWS) secrets.
When a secret is queried, not only is the secret cached in memory, but a mapping between ID and key is also cached. This allows lookup by either ID or key, as shown below.
WordPress REST API Testing Tool.
Discover and test WordPress REST API endpoints.
free and open API designed to serve weather forecast data using the same syntax as Dark Sky.
Build better APIs faster. Open source API management platform.
Redefined API management for developers. Quickly add API keys, rate limiting, and usage analytics to your API at any scale.
HTTP API for Claude Code, Goose, Aider, and Codex.
Control Claude Code, Goose, Aider, and Codex with an HTTP API.
Incrementally adoptable type-safety for your new and existing APIs. RPC-like client, contract, and server implementation for a pure REST API
ts-rest offers a simple way to define a contract for your API, which can be both consumed and implemented by your application, giving you end to end type safety without the hassle or code generation.
LocalAI is the free, Open Source OpenAI alternative. LocalAI act as a drop-in replacement REST API that’s compatible with OpenAI API specifications for local inferencing. It allows you to run LLMs, generate images, audio (and not only) locally or on-prem with consumer grade hardware, supporting multiple model families and architectures. Does not require GPU. It is created and maintained by Ettore Di Giacinto.
Hurl, run and test HTTP requests with plain text.
Hurl is a command line tool that runs HTTP requests defined in a simple plain text format.
It can chain requests, capture values and evaluate queries on headers and body response. Hurl is very versatile: it can be used for both fetching data and testing HTTP sessions.
Hurl makes it easy to work with HTML content, REST / SOAP / GraphQL APIs, or any other XML / JSON based APIs.
Easier than "sacarse los mockos".
Create API mocks collaboratively, fully online and with custom code logic.
RSS feed builder created with Bun🥖 and Hono🔥- builds from webpages and/or REST API calls
AI- Native Platform for Building Internal Tools.
Low-code platform for building business applications. Connect to databases, cloud storages, GraphQL, API endpoints, Airtable, Google sheets, OpenAI, etc and build apps using drag and drop application builder. Built using JavaScript/TypeScript. 🚀
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JobSet: a k8s native API for distributed ML training and HPC workloads
JobSet is a Kubernetes-native API for managing a group of k8s Jobs as a unit. It aims to offer a unified API for deploying HPC (e.g., MPI) and AI/ML training workloads (PyTorch, Jax, Tensorflow etc.) on Kubernetes.
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Runbook Automation.
Enable Self-Service Operations: Give specific users access to your existing tools, services, and scripts. Rundeck by PagerDuty is an open source runbook automation service with a web console, command line tools and a WebAPI. It lets you easily standardize tasks to improve operational quality by deploying automation across a set of nodes.
Docker image that echoes request data as JSON; listens on HTTP/S, useful for debugging.
The agents.json Specification is an open specification that formally describes contracts for API and agent interactions, built on top of the OpenAPI standard.
MessagePack is an extremely efficient object serialization library. It's like JSON, but very fast and small.
It's like JSON. but fast and small. MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.
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expose REST APIs from a Rust program.
Dropshot is a general-purpose crate for exposing REST APIs from a Rust program.