SurfSense

SurfSense is an open-source AI research assistant for teams that need enterprise AI search and real-time chat over internal knowledge sources.

Key capabilities include:

• Connect and sync knowledge sources across tools such as Notion, Google Drive, Gmail, Slack, Linear, YouTube, and GitHub, creating a shared knowledge hub for documents and conversations
• Model flexibility with support for 150+ LLMs and 6,000+ embedding models, plus local inference options (including vLLM, Ollama, llama.cpp, and LM Studio) for privacy-focused deployments
• 2-tier retrieval-augmented generation (RAG) designed to improve context and answer quality, with cited answers and clickable source references for verification
• Team collaboration features like live edits, presence indicators, and in-context comments, plus unlimited podcast creation (up to 20 minutes) with multiple text-to-speech options

Pricing: Free (open-source, Apache-2.0 license)

What makes it notable is its focus on team collaboration and choice of AI models rather than locking users into a single provider, positioning it as an open alternative to tools like NotebookLM for organizations that want customization and local deployment options.