Open Source

AgentOS

Open-source TypeScript agent runtime whose agents can forge their own tools

AgentScope

Alibaba Tongyi Lab's open-source framework for multi-agent applications

AI4Bharat

IIT Madras lab releasing open translation, speech and language models for India

Aikido Security

All-in-one code, cloud and runtime security for developer teams

AnythingLLM

Self-hosted RAG chat over your files, MIT-licensed

Arize Phoenix

Free, self-hosted LLM tracing and evaluation

AutoGen by Microsoft

Microsoft's open-source multi-agent framework, now in maintenance mode

BabyAGI

The 2023 task-loop agent, now a family of open-source experiments

BharatGen

Government-funded Indic language and speech models led by IIT Bombay

Bifrost

Maxim AI's open-source Go gateway for routing, budgeting and caching LLM traffic

BLOOM

BigScience's 2022 open multilingual model, still downloadable, now a research artefact

Botpress

AI customer support agents and helpdesk, billed per conversation

Chat2DB

AI SQL copilot that turns plain-language questions into dialect-accurate queries across 30+ databases — from MySQL to Snowflake.

Code Llama

Meta's 2023 code models on Llama 2, frozen but still downloadable

CodeFuse 蚂蚁CodeFuse

Ant Group's open code models, training frameworks and AI coding tools

CodeGeeX

Zhipu AI's free coding plugin, now overshadowed by its GLM Coding Plan

CopilotKit

Open-source SDK for agent-native app interfaces, makers of AG-UI

Crush

Charm's source-available, multi-model terminal coding agent

Daytona

Sub-100ms sandboxes for AI agents that write and run code — now closed source

DeepEval

Pytest-style unit testing for LLM apps, 50+ metrics, Apache 2.0

DeepInfra

Pay-as-you-go inference for 100+ open and proprietary models, plus GPUs

DeepSeek

Hangzhou lab shipping MIT-licensed V4 models and a very cheap API

Dify

Open-source canvas for LLM workflows, RAG knowledge bases and agents

FauxPilot

Self-hosted Copilot-style completion server on your own GPU — dormant since 2023

Fern

Input OpenAPI. Output SDKs in up to ten languages, API docs and CLIs — now a Postman company.

Fish Audio

Expressive TTS and voice cloning in 80+ languages, with open weights

FLUX

Black Forest Labs' image and video models: open weights plus a pay-as-you-go API

Google Agent Development Kit (ADK)

Google's open-source, code-first framework for multi-agent AI

Google Flow Music (formerly Riffusion)

The viral spectrogram experiment that became ProducerAI, now Google Flow Music

GPT4All

Nomic's free offline LLM app, no longer actively developed

Guanaco

The 2023 research chatbots that demonstrated QLoRA 4-bit fine-tuning

Helicone

Open-source LLM observability, now in maintenance mode

HuggingChat

Chat with open-weight models, auto-routed by Omni and paid in credits

Jan

Open-source offline ChatGPT alternative from Singapore's Menlo Research

Kilo Code

MIT-licensed coding agent with 500+ models at provider rates

Kyutai (Moshi / Unmute)

Paris non-profit lab releasing open speech models: Moshi, Unmute and Pocket TTS