A collective list of free APIs
- api
- public-apis
- free
- apis
Repository Index
47,133 repositories indexed
1–24 of 67 · Most stars
freeCodeCamp.org's open-source codebase and curriculum. Learn math, programming, and computer science for free.
- learn-to-code
- nonprofits
- programming
- nodejs
For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.
✨ Innovative and open-source visualization application that transforms various data formats, such as JSON, YAML, XML and CSV into interactive graphs.
- json
- tool
- react
- visualization
AirLLM 2.8T LLM inference with single 4GB GPU
- chinese-nlp
- finetune
- generative-ai
- instruct-gpt
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
Open source, privacy-first web analytics. Lightweight, cookie-free Google Analytics alternative. Self-hosted or cloud.
🕸️ Web apps in pure Python 🐍
- python
- framework
- open-source
- gui
🔥 人人可用的开源 BI 工具，数据可视化神器。An open-source BI tool alternative to Tableau.
- tableau
- data-visualization
- superset
- apache-doris
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.
Empowering People Ethically 🚀 — Matomo is hiring! Join us → https://matomo.org/jobs Matomo is the leading open-source alternative to Google Analytics, giving you complete control and built-in privacy. Easily collect, visualise, and analyse data from websites & apps. Star us on GitHub ⭐️ – Pull Requests welcome!
FinGPT: Open-Source Financial Large Language Models! Revolutionize 🔥 We release the trained model on HuggingFace.
📊 Cube Core is open-source semantic layer for AI, BI and embedded analytics
The best free and open-source automated time tracker. Cross-platform, extensible, privacy-focused.
- quantified-self
- activitywatch
- productivity
- time-tracking
Open-source JavaScript charting library behind Plotly and Dash
💿 Free software that works great, and also happens to be open-source Python.
GenBI (Generative BI) for AI agents, an open-source, governed text-to-SQL through an open context layer that turns natural-language questions into trusted dashboards, charts, and SQL across 20+ data sources, such as BigQuery, Snowflake, PostgreSQL, ClickHouse, Amazon Redshift, Databricks and more.
- bigquery
- duckdb
- llm
- postgresql
This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .NET, Java, TypeScript, JavaScript, Rust and Python. Designed for developers, it focuses on practical techniques for building modular, scalable, and secure AI workflows from session setup to service orchestration.
- csharp
- java
- javascript
- mcp
QuestDB is a high performance, open-source, time-series database
- time-series
- low-latency
- database
- sql
CVAT is a leading data annotation platform for image, video, audio, and 3D datasets. It offers open-source, cloud, and enterprise products, as well as labeling services, with AI-assisted labeling, quality assurance, team collaboration, analytics, and developer APIs.
- video-annotation
- computer-vision
- computer-vision-annotation
- image-annotation
A fully open source & end-to-end encrypted note taking alternative to Evernote.
Open-source, self-hosted alerting for metrics, logs, and databases. Includes a built-in AI agent and MCP server.
- monitoring
- time-series
- nightingale
- tsdb
🐸 Rybbit - open-source and privacy-friendly alternative to Google Analytics that is 10x more intuitive.
- analytics
- google-analytics
- product-analytics
- web-analytics
Cleanlab's open-source library is the standard data-centric AI package for data quality and machine learning with messy, real-world data and labels.
- weak-supervision
- data-cleaning
- data-quality
- noisy-labels