Alternatives to Rig

Open-source TypeScript toolkit for building AI apps and agents across 100+ models with streaming, tools, and fallbacks

A Rust library for building fast, streaming LLM pipelines — indexing, retrieval, and autonomous agents.

Free MIT-licensed Python framework for multi-agent workflows with handoffs, guardrails, sandbox agents, and voice agents.

An integration layer that gives AI agents and apps managed auth plus 10,000+ prebuilt tools across 3,000+ APIs.

SmolAgents is Hugging Face's Apache-2.0 Python library for building agents that write their actions as executable code.

Eino is an open-source Go framework from ByteDance for building LLM apps, agents, and graphs in your existing Go backend.

Build AI agents on small language models — locally, on your own server, or through 10 hosted providers.

Open-source Go SDK giving one unified API across 25+ LLM providers with streaming, typed structured output, and MCP support.

Prompt engineering IDE for building, testing, and optimizing prompts across 150+ LLMs from 15 providers.

Microsoft's open-source framework for building conversational and event-driven AI agents in Python and .NET.

Open-source TypeScript framework for building durable AI agents and workflows, with a hosted platform for observability and cloud deployment.

Microsoft's open-source SDK for building AI agents and copilots with plugins, memory, and multi-agent orchestration.

Open-source Python library for constraining LLM output with regex, context-free grammars, and inline control flow — archived since October 2023.

BAML is a type-safe programming language for building AI agents and structured LLM output that compiles instead of guessing.

Microsoft's open-source, code-first Python framework for building stateful, data-intensive conversational AI agents.

OpenAI Cookbook is a free, MIT-licensed GitHub repository of example code and guides for working with the OpenAI API.

Google's open-source framework for building AI-powered and agentic apps in TypeScript, Go, Python, and Dart.

Open-source (MIT) MCP testing and full-stack MCP App framework for building ChatGPT Apps and Claude Connectors from one React codebase.

A headless React hooks library that runs a Vicuna-13B chat model entirely in your browser via WebGPU, with no server round-trip.

Open-source Java library that puts a unified LLM and vector store API inside your JVM app

Mirascope is an open-source Python library that turns LLM calls, tools, and prompt versioning into plain decorated functions.

Zhipu GLM (Z.ai) ships the open-weights GLM-5.3 family, full-modality MaaS APIs, and autonomous agents like AutoGLM and GLM-PC.

Microsoft's developer framework for building and hosting agentic AI on Azure, with Python, C#, and Go SDKs and a GA Agent Harness runtime.

Tessl is an agent enablement platform that governs, tests, and optimizes the AI agent skills your dev team's coding agents actually run.

GitLab Duo is GitLab's agentic AI layer, adding specialized AI agents, code review, and policy-governed automation directly into DevSecOps workflows.

Open-source Python library that constrains LLM decoding with finite-state machines so Pydantic, JSON Schema, regex, and grammar outputs come out valid every

Pydantic AI is a typed Python agent SDK: define a model string and an output type, get validated structured results every run.

Coder is a self-hosted platform for cloud development environments that governs the AI coding agents and LLM traffic running inside them.

Open-source, self-hosted AI agent whose SquillaRouter routes each step to cheap or flagship models to cut token cost.

MIT-licensed, self-hosted AI agent with persistent memory that connects to 20+ chat platforms and builds its own reusable skills.