LLMStack

LLMStack is an open-source platform for building AI agents, workflows, and applications using your own data. It supports model chaining across major providers including OpenAI, Cohere, Stability AI, and Hugging Face, and can import data from web URLs, sitemaps, PDFs, audio, PowerPoint files, Google Drive, and Notion to connect to LLM-powered apps. Apps built on the platform can be shared publicly or restricted via a granular permission model with viewer and collaborator roles. The site references a cloud offering in addition to self-hosted deployment; no specific pricing is stated on the page.