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SiYuan: Privacy-First, Self-Hosted Personal Knowledge Management Software
SiYuan is a privacy-first, self-hosted, and fully open-source personal knowledge management software. Written in TypeScript and Go, it offers robust features for note-taking, block-level referencing, and AI integration, making it a powerful alternative to popular tools.

Memvid: Revolutionizing AI Memory with Video Compression and Semantic Search
Memvid is an innovative Python library that transforms vast amounts of text data into compact, searchable MP4 video files. It leverages advanced video codecs to store millions of text chunks as QR codes, enabling lightning-fast semantic search without the need for traditional databases. This approach offers significant storage savings, true portability, and an offline-first design for AI memory applications.

SurfSense: Open Source AI Research Agent with Extensive Integrations
SurfSense is an open-source AI research agent designed as an alternative to tools like NotebookLM and Perplexity. It integrates with a wide array of external sources, including search engines, Slack, Notion, and GitHub, allowing users to connect their personal knowledge base. This highly customizable tool offers features like powerful search, chat with saved content, cited answers, and local LLM support for enhanced privacy.