Build high-quality LLM apps - from prototyping, testing to production deployment and monitoring.

Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.

🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

A language model programming library.

AI Observability & Evaluation

232+ Claude Code skills & agent plugins for Claude Code, Codex, Gemini CLI, Cursor, and 8 more coding agents — engineering, marketing, product, compliance, C-level advisory.

🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓

Aim 💫 — An easy-to-use & supercharged open-source experiment tracker.

The Enterprise-Grade Production-Ready Multi-Agent Orchestration Framework. Website: https://swarms.ai

A CLI tool to convert your codebase into a single LLM prompt with source tree, prompt templating, and token counting.

WitNote is a local-first AI writing companion for macOS and Windows.

🪨 why use many token when few token do trick — Claude Code skill that cuts 65% of tokens by talking like caveman

Fine-tuning causal language models with an additional JEPA-style representation regularisation loss as well as a plain Hugging Face trainer

A flexible Monte Carlo Tree Search framework with PyTorch for decision-making in language models.

Create synthetic datasets from scratch using AI-powered generation. Define topics, customize prompts, and generate high-quality reasoning traces in the SYNTH format.

A terminal multiplexer and user interface (TUI) with a super-powerful agent. Tamux is the only agent runtime that treats the daemon like an operating system kernel – sessions, targets, memory, mana…

The agent that grows with you

Convert Scratch Blocks programs into Python, with Pydiode interpretation support including MicroPython extensions for seamless web-based Python execution.

Scratch like block programming, for Minecraft Mod making

Interface to connect Scratch and Minecraft. You can move the player, place blocks, send chat messages, etc. in Minecraft from visual programming environment, Scratch.

Block-style programming environment for multi agent system, based on MIT Scratch.

Scratch for the AI Era — Block-based AI interaction for kids. No prompts, just drag and create.

A Scratch-inspired visual environment for learning propositional logic, where users build and simplify logical expressions through composable blocks.

New block based programming language, with advanced features, built from ground up in C

Virtual Machine used to represent, run, and maintain the state of programs for Scratch 3.0

Interactive samples/demos for LiteParse: a fast, local, model-free document parser

Chrome Plugin to download artifacts from a Claude conversation as a ZIP file

Browser extension that allows you to export chat conversations from the LLM sites ChatGPT and Claude to Markdown, XML, JSON, and HTML.