Alternatives to Choco Builder

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

Open-source framework for adding agent chat, generative UI, and human approvals to React apps on any agent backend.

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

Rig is an open-source Rust LLM framework for shipping type-safe AI agents across 20+ providers.

Marvin is an open-source Python framework that turns LLM calls into typed functions, agents, and Pydantic-validated results.

Open-source Rust library for building streaming, parallel LLM pipelines — data indexing, retrieval-augmented generation, and autonomous agents.

GitHub's AI coding agent for inline completion, delegated pull requests, code review, and recurring agent tasks across your repos.

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

Open-source Python library that constrains LLM output with regex, context-free grammars, and inline control flow.

Open-source React toolkit for generative UI that renders your own components from natural language

Open-source TypeScript SDK for streaming AI apps and agents across 100+ models, with built-in provider fallbacks

Genkit is Google's open-source AI SDK for building agentic AI apps in TypeScript, Go, Python, and Dart.

Open Strawberry is a free, open-source chain-of-thought inspector for reading and comparing model reasoning traces.

Open-source Python framework that adds retrieval-augmented document Q&A to your app in five lines of code

Open-source React chat UI components for building LLM chat interfaces in hours, not weeks

Open-source JS/TS toolkit for building multimodal LLM agents with streaming, validation, and managed memory

TOON is an open-source, token-efficient encoding of the JSON data model for LLM prompts, using 42.6% fewer tokens than JSON.

Open-source LLM from UC Berkeley that turns natural language into API calls and tool-using agent actions.

Open-source Java machine-learning framework plus a free REST API with 14 pre-trained NLP classifiers

A type-safe, open-source TypeScript library for orchestrating multi-step AI workflows on top of the Vercel AI SDK.

xsAI is an extra-small OpenAI-compatible AI SDK for JavaScript and TypeScript, 13.0 KB gzipped with every package included.

OpenUI turns AI agent responses into streaming generative UI built from your own component library.

Free browser markdown editor with Battle Mode for comparing OpenAI, Claude, and Gemini prompt outputs, client-side only.

PrivateGPT is the open-source on-premise RAG framework for local document Q&A — 57k GitHub stars, zero cloud calls.

Free OpenAI API examples and Python notebooks for building chat, embeddings, and RAG apps

Open-source Python RAG framework that turns your PDFs, Notion pages, and websites into a queryable AI app in a few lines of code.

SwiftOpenAI: an MIT-licensed Swift package for calling the OpenAI API with native async/await and Combine on Apple platforms.

Open-source Java library that tokenizes text with OpenAI's BPE encodings so you can count, encode and decode locally

BAML is a type-safe, Turing-complete language for agentic and LLM code that compiles typed Python and TypeScript SDKs.

Local MCP context gateway that compresses and filters what your AI coding agent reads