API tools
Design, test, document and mock APIs.
81 products
C
Command line tool and library for transferring data with URLs.
Free planOpen source
O
The unified interface for every model
Free planOpen source
K
The AI connectivity platform for platform builders
Free planOpen source
A
Domain-driven app development with dynamic UI and APIs.
Open source
A
The BaaS Framework you run
Free planOpen source
M
An open-source standard for connecting AI applications to external systems
Open source
Y
YAML Ain't Markup Language
Open source
M
A search engine for CPAN.
Free planOpen source
S
API Documentation & Design Tools for Teams
Open source
G
Monitor, debug, and benchmark your internet infrastructure from a globally distributed set
Free planOpen source
G
The API language for humans and agents
Open source
F
The web data API to search, scrape, and interact with the web at scale, turning websites L
Free planOpen source
P
End-to-end AI engineering stack for data validation and agents
Free planOpen source
I
The collaborative API development platform.
Free planOpen source
A
The API Orchestration Platform for AI Agents, Web, and Mobile Apps
Free planOpen source
R
A free, open-source API for generating random user data. Like Lorem Ipsum, but for people.
Free planOpen source
J
The JSON validator.
Free planOpen source
M
an interactive HTTPS proxy
Free planOpen source
G
Painless self-hosted Git service
Free planOpen source
T
One unified control plane for every API and AI protocol
Free planOpen source
W
Open source command line tools rendering HTML to PDF and images
Open source
O
The open source SDN platform
Free planOpen source
F
Build Forms, APIs, and Agentic Workflows with One Self-Hosted Enterprise Application Comp
Free planOpen source
S
API testing tool for SOAP and REST APIs
Free planOpen source
H
Open source API development ecosystem.
Open source
M
The web, ready for AI
Free planOpen source
P
Open source backend for mobile and web applications
Open source
G
Route Planning For Your Application
Free planOpen source
M
Like JSON, but fast and small
Open source
K
next generation web framework for node.js
Free planOpen source
F
Free IP geolocation HTTP API
Free planOpen source
G
Validate schemas and detect changes. Receive schema change notifications. Keep operations,
Free planOpen source
A
The easiest way to create your web API
Open source
D
Instantly Generate Governed REST APIs from Any Database
Free planOpen source
O
The open-source alternative to Claude Managed Agents
Free planOpen source
N
Build integrations with AI
Free planOpen source
K
High-performance open source API gateway
Free planOpen source
P
User-updated map of public pinball machines worldwide.
Free planOpen source
C
Open source status page system for communicating downtime
Free planOpen source
W
GraphQL Federation, built to govern
Free planOpen source
E
Free Online Toolbox for developers
Free planOpen source
L
Serverless + Microservices
Open source
L
A successor to log4j 1.x, built on a generic architecture with three modules: logback-core
Free planOpen source
F
A blog covering Flickr's engineering work, open source repositories, and API development.
Open source
F
A software vendor developing various software applications and development tools.
Free planOpen source
M
Headless BI - model your data once and consume it wherever you want
Open source
T
Transcript API for social media video
Free planOpen source
I
Real-time and historical market indices JSON API for S&P 500, Nasdaq & Dow Jones.
Open source
N
Create and sell NFTs and tokens on multiple blockchains at once
Open source
M
The developer API for programmatic access to meeting data across Zoom, Google Meet, and,
Free planOpen source
P
Free image sharing, linking and tracking
Free planOpen source
G
Turn any data source into a GraphQL API.
Open source
R
Debug webhooks without deploying anything
Free planOpen source
J
Code execution made simple for every business
Free planOpen source
F
Build and manage REST APIs with an open source platform and AI/MCP agents.
Open source
S
Host and manage Git, Mercurial, and Subversion repositories over HTTP.
Open source
C
Webhook gateway for sending and receiving events reliably.
Free planOpen source
P
A proxy server that pins client connections open to make building realtime API endpoints
Open source
C
ComfyUI for everyone on your team
Open source
C
Open Source Integration Layer for AI Agents
Free planOpen source
S
Zero code network tracer
Free planOpen source
H
Open-source webhooks as a service.
Free planOpen source
C
Walk any paper's citation graph, free
Free planOpen source
W
Website, Uptime, API, SSL & DNS Monitoring
Free planOpen source
A
The knowledge layer for AI agents
Free planOpen source
A
Build AI chat and search experiences
Free planOpen source
C
Real-time certificate transparency log update stream
Open source
T
A simple way to share small amounts of data
Open source
D
A unified interface for SQL and NoSQL database management.
Free planOpen source
H
Run and test HTTP requests with plain text and curl.
Open source
D
A command-line DNS client.
Open source
D
Free JSON API for dog breeds, pictures, groups, and facts
Free planOpen source
Y
The local-first API client
Free planOpen source
S
Schema language from the future
Open source
C
The Simplest Way to Connect Apps to Your AI Agent
Open source
G
Utilities to build powerful, performant and extensible GraphQL APIs rapidly
Free planOpen source
C
Open Source Report and Document Generator.
Free planOpen source
A
High-level API description language for web APIs
Open source
P
Apple Wallet and Google Wallet, one API. Wallet passes, shipped today.
Free planOpen source
S
Create a fully working prototype within minutes
Free planOpen source
T
The plants API
Free planOpen source