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One SQL interface over APIs, files, and live sources — built for agents.

A collective list of free APIs

Python SDK, Proxy Server (AI Gateway) to call 100+ LLM APIs in OpenAI (or native) format, with cost tracking, guardrails, loadbalancing and logging. [Bedrock, Azure, OpenAI, VertexAI, Cohere, Anthropic, Sagemaker, HuggingFace, VLLM, NVIDIA NIM]

Shannon Lite is an autonomous, white-box AI pentester for web applications and APIs. It analyzes your source code, identifies attack vectors, and executes real exploits to prove vulnerabilities before they reach production.

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins.

Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user cases over night. Consume as a service on Ory Network or self-host. Trusted by OpenAI and many others for scale and security. Written in Go.

ImageMagick is a free, open-source software suite for creating, editing, converting, and displaying images. It supports 200+ formats and offers powerful command-line tools and APIs for automation, scripting, and integration across platforms.

List of Permanent Free LLM API (API Keys)

Nuclei is a fast, customizable vulnerability scanner powered by the global security community and built on a simple YAML-based DSL, enabling collaboration to tackle trending vulnerabilities on the internet. It helps you find vulnerabilities in your applications, APIs, networks, DNS, and cloud configurations.

Google Gen AI Python SDK provides an interface for developers to integrate Google's generative models into their Python applications.

Open-source reporting platform to build and share live dashboards from APIs, SQL and NoSQL databases, with powerful AI assistant, scheduling, and embeddable charts 📈📊

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

Fully Local Manus AI. No APIs, No $200 monthly bills. Enjoy an autonomous agent that thinks, browses the web, and code for the sole cost of electricity. 🔔 Official updates only via twitter @Martin993886460 (Beware of fake account)

A collaborative list of public APIs for developers

Open-source data movement for ELT pipelines and AI agents — from APIs, databases & files to warehouses, lakes, and AI applications. Both self-hosted and Cloud.

Connect APIs, remarkably fast. Free for developers.

Python SDK for interacting with the MCP Toolbox for Databases.

Official Documentation for the Binance Spot APIs and Streams

Computer Vision Annotation Tool (CVAT) is a leading platform for building high-quality visual datasets for vision AI. It offers open-source, cloud, and enterprise products, as well as labeling services, for image, video, and 3D annotation with AI-assisted labeling, quality assurance, team collaboration, analytics, and developer APIs.

The Cloud-Native API Gateway and AI Gateway

Terraform enables you to safely and predictably create, change, and improve infrastructure. It is a source-available tool that codifies APIs into declarative configuration files that can be shared amongst team members, treated as code, edited, reviewed, and versioned.

The flexible backend for all your projects 🐰 Turn your DB into a headless CMS, admin panels, or apps with a custom UI, instant APIs, auth & more.

115+ production-ready React Hooks for sensors, UI, state & browser APIs. Tree-shakable, SSR-safe, TypeScript-first. Used by Shopee, PDD & Ctrip. Inspired by VueUse.

MCP Toolbox for Databases is an open source MCP server for databases.

A Python SDK for Vertex AI, a fully managed, end-to-end platform for data science and machine learning.

🧙‍♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.

An API/Schema registry - stores APIs and Schemas.

An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs

Training neural networks on Apple Neural Engine via reverse-engineered private APIs

Generated Java code for Google APIs

A frontend Framework for single-page applications on top of REST/GraphQL APIs, using TypeScript, React and Material Design

AXe is a CLI tool for interacting with Simulators using Apple's Private Accessibility APIs.

🦎 A multi-protocol edge & service proxy. Seamlessly interface web apps, IoT clients, & microservices to Apache Kafka® via declaratively defined, stateless APIs.

An HTTP server with APIs useful in testing HTTP clients. Inspired by httpbin, but isn't a clone.

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

A collection of Editors, Linters, Parsers, Code Generators, Documentation, Testing

😎 A list of awesome projects related to OpenAPI 3.0.x, curated by the community

A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.

Gin is a high-performance HTTP web framework written in Go. It provides a Martini-like API but with significantly better performance—up to 40 times faster—thanks to httprouter. Gin is designed for building REST APIs, web applications, and microservices.

Web APIs for Django. 🎸

🌻 A pluggable, highly optimized Jetpack Compose and Kotlin Multiplatform image loading library that fetches and displays network images, compatible with Glide, Coil, and Fresco.

🏆 Real-Time no-code, powerful and secure ORM 🚀 providing APIs and Docs without coding by Backend, and Frontend(Client) can customize response JSONs 🏆 实时 零代码、全功能、强安全 ORM 库 🚀 后端接口和文档零代码，前端(客户端) 定制返回 JSON 的数据和结构

ClawCode is claude code inspired implementation in python and Rust focused on agents and experience-based evolution, and is an Open-source coding-agent CLI for Anthropic, OpenAI, Gemini, DeepSeek, GLM, Kimit, Ollama, Codex, GitHub Models, and 200+ models via OpenAI-compatible APIs.

Open-source native macOS HTTP debugging proxy — intercept HTTPS, inspect APIs, mock responses, debug WebSocket & GraphQL. Community-driven. For developers, by developers.

A production-ready runtime framework for agent apps with secure tool sandboxing, Agent-as-a-Service APIs, scalable deployment, full-stack observability, and broad framework compatibility.

NyaProxy acts like a smart, central manager for accessing various online services (APIs) – think AI tools (like OpenAI, Gemini, Anthropic), image generators, or almost any web service that uses access keys. It helps you use these services more reliably, efficiently, and securely.

Google Gen AI Java SDK provides an interface for developers to integrate Google's generative models into their Java applications.

Learn .NET 10 Web APIs the Right Way – From Basics to Production-Ready!

The human toll of Israel's ongoing genocide in names & numbers. Use the data from our APIs to tell their story.

Source only package that exposes newer APIs, .net features, and C# features to older runtimes.

Bridges UIKit presentation APIs to a SwiftUI API so you can use presentation controllers, interactive transitions and more.

C# DSL for writing readable tests for HTTP-based APIs

Build APIs your users love ❤️ with Speakeasy. ✨ Polished and type-safe SDKs. 🌐 Terraform providers, MCP servers, CLIs and Contract Tests for your API. OpenAPI native.

Google Cloud Rust Client Libraries

An example of integration testing ASP.NET Core Minimal hosting and APIs

Eliminate API integration headaches with Specmatic's no-code AI-powered API development suite. Teams ship APIs 10x faster by transforming specifications into executable contracts instantly—no coding required, no integration surprises.

Scala testing library with actionable errors and extensible APIs

SystemVerilog 2017 Pre-processor, Parser, Elaborator, UHDM Compiler. Provides IEEE Design/TB C/C++ VPI and Python AST & UHDM APIs. Compiles on Linux gcc, Windows msys2-gcc & msvc, OsX

A lightweight ORM framework for Kotlin with strong-typed SQL DSL and sequence APIs.

Kubebuilder - SDK for building Kubernetes APIs using CRDs

Every web site provides APIs.

An API explorer for RESTful Hypermedia APIs using HAL or HAL-FORMS

Library for writing a Kubernetes-style API server.

Microsoft Authentication Library (MSAL) for Python makes it easy to authenticate to Microsoft Entra ID. General docs are available here https://learn.microsoft.com/entra/msal/python/ Stable APIs are documented here https://msal-python.readthedocs.io. Questions can be asked on www.stackoverflow.com with tag "msal" + "python".

The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP APIs, GraphQL, WebSocket, and more. Use any Node.js module.

Auto-generated Google APIs for Go.

Chat with your notes & see links to related content with AI embeddings. Use local models or 100+ via APIs like Claude, Gemini, ChatGPT & Llama 3

An opinionated framework for creating REST-like APIs in Ruby.

Never stop coding. Free AI gateway: one endpoint, 160+ providers, RTK+Caveman stacked compression up to ~95% eligible context savings, smart auto-fallback, MCP/A2A, multimodal APIs, Desktop/PWA.

🔥 The open-source no-code platform for web scraping, crawling, search and AI data extraction • Turn websites into structured APIs in minutes 🔥

Rust friendly bindings to *nix APIs

Repair malformed JSON from LLMs, APIs, logs, and user input in Python.

Local-first, open-source AI assistant for your data. Unify tasks, notes, docs, photos, and bookmarks. Private, self-hosted, and extensible via APIs.

🌊 Modern swell buoy charts + Aggregated surf forecast from Surfline & Spitcast APIs

Google Cloud Client Libraries for Go.

The Windows App SDK empowers all Windows desktop apps with modern Windows UI, APIs, and platform features, including back-compat support, shipped via NuGet.

Unofficial Python client library for Semantic Scholar APIs.

End-to-end typesafe APIs in Nuxt applications.

C++ Client Libraries for Google Cloud Services

Hive Console is part of the Hive GraphQL platform. Schema registry and analytics for GraphQL federation and other GraphQL APIs

An open-source alternative to Yahoo Finance's market data APIs with higher reliability.

A query engine for any combination of data sources. Query your files and APIs as if they were databases!

The Swift code generator for your assets, storyboards, Localizable.strings, … — Get rid of all String-based APIs!

Intermediate Graphics Library (IGL) is a cross-platform library that commands the GPU. It provides a single low-level cross-platform interface on top of various graphics APIs (e.g. OpenGL, Metal and Vulkan).

Strongly typed HTTP/JSON APIs for browsers and microservices

Massimo is an API SDK client and CLI tool for creating clients for remote OpenAPI or GraphQL APIs

OpenAI-Compatible RESTful APIs for Amazon Bedrock

Fix DecodePointer, EncodePointer,RegDeleteKeyEx etc. APIs not found in Windows XP RTM.

The ODP project is an open-source, cross-platform set of application programming interfaces (APIs) for the networking data plane

WilmerAI is one of the oldest LLM semantic routers. It uses multi-layer prompt routing and complex workflows to allow you to not only create practical chatbots, but to extend any kind of application that connects to an LLM via REST API. Wilmer sits between your app and your many LLM APIs, so that you can manipulate prompts as needed.

A set of common utils for consuming Web APIs with Angular

A Flutter plugin that provides images, videos, and audio abstraction management APIs without interface integration, available on Android, iOS, macOS and OpenHarmony.

Jupyter protocol client APIs

Azure Governance Visualizer aka AzGovViz is a PowerShell script that captures Azure Governance related information such as Azure Policy, RBAC (a lot more) by polling Azure ARM, Storage and Microsoft Graph APIs.

A collection of samples of different Android OS platform APIs.

The first open-source AI-driven tool for automatically generating system-level test cases (also known as fuzzing) for web/enterprise applications. Currently targeting whitebox and blackbox testing of Web APIs, like REST, GraphQL and RPC (e.g., gRPC and Thrift).

Connects MCP to major 3D printer APIs (Orca, FULU's Orca/Bambu, OctoPrint, Klipper, Duet, Repetier, Prusa, Creality). Control prints, monitor status, and perform advanced STL operations like scaling, rotation, sectional editing, and base extension. Includes slicing and visualization.

Golang version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.