TriliumNext/Trilium

Trilium Notes is a free and open-source note-taking application that helps users build large personal knowledge bases with hierarchical organization and knowledge graph capabilities.

The tool addresses the problem of managing and connecting large volumes of personal information by providing a structured, hierarchical note system designed for knowledge base construction. It operates as a cross-platform application available on desktop via Electron and as a self-hosted server option, allowing users to maintain full control over their data locally. The application supports building interconnected notes through a knowledge graph model, enabling users to create relationships between ideas and information across their knowledge base.

Trilium suits individuals and teams building substantial personal wikis or knowledge management systems who want to avoid cloud-dependent solutions. The self-hosted server option makes it appropriate for those needing to share knowledge bases across devices or with collaborators while maintaining data sovereignty. The application is scriptable, allowing automation and customization beyond its built-in features. Users should expect a mature tool with comprehensive documentation available both online and within the application itself, with Docker deployment options for server installations.

The project maintains a substantial base of real-world adopters, as evidenced by the fact that almost all open issues are raised by outside users rather than the core team. Maintainers typically respond to new issues and pull requests within a day. Work in the issue tracker is dominated by UI improvements and tasks spanning a range of difficulty levels from easy to hard.