Trilium

Trilium Notes is a free, open-source application designed for serious knowledge management. It allows you to build a large, structured repository of your notes and ideas. The hierarchical organization system helps you create a logical, tree-like structure for your information, making it easy to navigate and connect related concepts. As a cross-platform tool, your knowledge base is accessible and consistent whether you're on Windows, macOS, or Linux. Focus on accumulating and structuring your knowledge without limitations.