SiYuan is a personal knowledge management system centered around privacy protection, supporting block references and bidirectional linking. Written in TypeScript and Golang, it offers features such as block-level content organization, a WYSIWYG Markdown editor, content block snapshots, mind maps, back-linking, and references. SiYuan allows for nonlinear content organization, facilitates information connectivity, and aids in building a knowledge network. Moreover, SiYuan supports data self-hosting, ensuring user data security and privacy. It boasts an active community and a rich ecosystem of plugins, compatible with multiple operating systems including Windows, macOS, and Linux. Most features are free, with premium features available for a fee, such as data synchronization.

ODIN is an Obsidian plugin that knowledge-graphs your notes, facilitating intelligent question answering, link prediction, and other capabilities. It helps users manage knowledge points and build comprehensive knowledge systems. Key features of ODIN include: LLM-powered intelligent question answering for direct querying of knowledge points within notes; global note network visualization, presenting note content in a knowledge graph format; semantic-based link prediction, automatically establishing connections between notes; and semantic-based node suggestions for discovering key knowledge points within notes. ODIN significantly enhances Obsidian's knowledge management capabilities and is an essential tool for authors building their personal knowledge management systems.

Quanta Quest is an AI-driven personal knowledge management platform seamlessly connecting and searching all of a user's personal data sources while offering precise AI search capabilities. The product emphasizes a privacy-first security policy, utilizing open-source systems to ensure transparency and top-notch security. It supports connections to various personal data sources like Gmail, Dropbox, and Notion, creating a comprehensive personal knowledge base. Quanta Quest's AI search feature allows users to quickly locate information across multiple platforms, enhancing personal productivity. Background information shows it is well-loved by global knowledge enthusiasts, with user feedback indicating that Quanta Quest significantly simplifies their personal information management. The product features a straightforward pricing strategy that works well regardless of the knowledge base size.

Zhiwo AI is a personalized and professional AI knowledge management assistant designed to help users recall knowledge, answer questions, create content, generate summaries, and mind maps. Through features like Omni Knowledge Collection, AI Knowledge Processing, and AI Q&A, it enables users to manage knowledge efficiently, creating a personal second brain. Zhiwo AI is suitable for various fields including academic research, government consulting, financial industry research, exam preparation, scientific study, and medical paper reading, making it the best choice for professionals.

SiYuan is a personal knowledge management system centered around privacy protection, supporting block references and bidirectional linking. Written in TypeScript and Golang, it offers features such as block-level content organization, a WYSIWYG Markdown editor, content block snapshots, mind maps, back-linking, and references. SiYuan allows for nonlinear content organization, facilitates information connectivity, and aids in building a knowledge network. Moreover, SiYuan supports data self-hosting, ensuring user data security and privacy. It boasts an active community and a rich ecosystem of plugins, compatible with multiple operating systems including Windows, macOS, and Linux. Most features are free, with premium features available for a fee, such as data synchronization.

Quivr is an AI-based cloud personal second brain that offers personalized search and knowledge management services by connecting files, applications, APIs, databases, and more. It enhances search relevance and knowledge discovery by continuously learning from the specific context of your organization. Quivr supports custom integrations, allowing users to select the GenAI model that best fits their tasks and receive more accurate responses based on prompt instructions.

Flot.ai's AI Memory is an AI-based personal knowledge management tool that helps users easily build and recall their personal knowledge libraries. It allows users to save text from any application or website to their AI memory with a simple click, and recall this information at any time through a conversation with AI. The product emphasizes its no-organization, easy access, and use, as well as its high emphasis on privacy, adhering to GDPR standards.

Smart Tab by NoteGPT is a plugin that combines bookmark management, AI learning, and knowledge base management. It helps users easily collect and manage labels, discover new insights, and build an AI-powered knowledge base. Through its AI learning capabilities, it understands and analyzes the content saved by users, providing key concepts and ideas and uncovering new perspectives. Suitable for team collaboration, learning, and personal knowledge management.

GitBook is a knowledge management tool that streamlines knowledge sharing for engineering teams. It supports editing in code documentation format and provides AI-powered search and insights. Sign up for free!

ODIN is an Obsidian plugin that knowledge-graphs your notes, facilitating intelligent question answering, link prediction, and other capabilities. It helps users manage knowledge points and build comprehensive knowledge systems. Key features of ODIN include: LLM-powered intelligent question answering for direct querying of knowledge points within notes; global note network visualization, presenting note content in a knowledge graph format; semantic-based link prediction, automatically establishing connections between notes; and semantic-based node suggestions for discovering key knowledge points within notes. ODIN significantly enhances Obsidian's knowledge management capabilities and is an essential tool for authors building their personal knowledge management systems.