AI Developer Tools

Chroma

San Francisco, United States

Chroma is the leading open-source AI-native vector database, founded and headquartered in San Francisco, California. Founded by Jeff Huber and Anton Troynikov, Chroma provides an open-source embedding database designed for AI application developers featuring simple Python and JavaScript APIs, native embedding generation, in-memory and persistent storage modes, and seamless integration with LangChain, LlamaIndex, and other AI frameworks. Chroma also operates Chroma Cloud (currently in beta) providing managed Chroma deployments with global distribution. The open-source project has over 17,000 GitHub stars and millions of downloads, and Chroma raised 18 million Series A from Astasia Myers, Quiet Capital, and other investors at a 75 million valuation.

Hugging Face

New York, United States

Hugging Face is the worlds leading platform for open-source machine learning and AI development, founded and headquartered in New York City with major operations in Paris, France. Founded by Clement Delangue, Julien Chaumond, and Thomas Wolf, Hugging Face operates the Hugging Face Hub hosting over 1 million open-source AI models, 200,000 datasets, and 500,000 demo Spaces. The company maintains the influential Transformers, Datasets, Diffusers, and Accelerate Python libraries used by virtually every AI developer globally. Products include Hugging Face Pro for individuals, Inference Endpoints for production deployment, AutoTrain for no-code training, and Enterprise Hub for private organizations. Valued at 4.5 billion in its latest funding round.

LangChain

San Francisco, United States

LangChain is the worlds most popular framework for building LLM-powered applications, founded and headquartered in San Francisco, California. Founded by Harrison Chase and Ankush Gola, LangChain provides the open-source LangChain framework with Python and JavaScript libraries, the LangGraph orchestration framework for stateful AI agents, LangSmith for observability and evaluation, and LangServe for deployment. The platform supports integrations with all major LLMs including OpenAI, Anthropic, Google, Cohere, and open-source models, plus hundreds of vector databases, document loaders, and tools. LangChain has over 100,000 GitHub stars, is used by companies including Klarna, Replit, Rakuten, Elastic, and Morningstar, and raised 25 million Series A at a 200 million valuation.

LlamaIndex

San Francisco, United States

LlamaIndex is one of the leading data frameworks for building LLM applications and retrieval-augmented generation (RAG) systems, founded and headquartered in San Francisco, California. Founded by Jerry Liu (former Robust Intelligence and Quora ML engineer) and Simon Suo, LlamaIndex provides Python and TypeScript frameworks for connecting LLMs to private and proprietary data sources including documents, databases, APIs, and unstructured content. Products include the open-source LlamaIndex framework with 35,000 GitHub stars, LlamaParse for advanced document parsing, LlamaCloud managed RAG service for enterprises, and LlamaHub with hundreds of pre-built data connectors and tools. LlamaIndex raised 19 million Series A at a 90 million valuation.

Pinecone

New York, United States

Pinecone is a leading managed vector database service for AI applications, founded and headquartered in New York City. Founded by Edo Liberty (former head of Amazon AI Labs), Pinecone provides a fully managed vector database designed for high-performance similarity search and retrieval-augmented generation (RAG) at scale. Products include the Pinecone Serverless platform with pay-per-use pricing, Pinecone Pod-based deployments for predictable workloads, integration libraries for Python, Node.js, Java, and Go, and partnerships with all major LLM providers and orchestration frameworks. Pinecone serves over 5,000 customers including Notion, Gong, ClickUp, and Microsoft, and has raised over 138 million in funding at a 750 million valuation.

Vellum AI

San Francisco, United States

Vellum AI is a developer platform for building, evaluating, and deploying LLM-powered applications, founded and headquartered in San Francisco, California. Founded by Akash Sharma, Sidd Seethepalli, and Noa Flaherty, Vellum provides a complete development platform including the Prompt Engineering IDE for testing prompts across multiple LLMs, the Workflow Builder for visual AI agent orchestration, dataset management for evaluation, A/B testing with comparative model evaluation, deployment infrastructure with versioning and rollbacks, and observability for production AI applications. Vellum supports integration with all major LLM providers including OpenAI, Anthropic, Google, Mistral, and Cohere, and serves customers including Drata, Notable, and Reibus building production AI applications.

Weights and Biases

San Francisco, United States

Weights and Biases is the leading MLOps and AI development platform for machine learning experiment tracking, founded and headquartered in San Francisco, California. Founded by Lukas Biewald, Chris Van Pelt, and Shawn Lewis, Weights and Biases provides experiment tracking, model registry, hyperparameter optimization with Sweeps, dataset versioning with Artifacts, collaborative reports, and the Weights and Biases Weave framework for LLM evaluation and observability. The platform serves over 1 million ML practitioners and over 1,000 enterprises including OpenAI, Toyota, Lyft, Salesforce, and Booking.com. Acquired by CoreWeave in March for 1.7 billion, Weights and Biases continues operating as a standalone platform within CoreWeaves AI cloud ecosystem.