Trilium

Trilium Notes helps you organize your knowledge effectively through a powerful hierarchical system. Unlike linear notes, you can create complex trees of information, nesting notes within notes to represent relationships and build context. This makes it perfect for students, researchers, and lifelong learners managing large amounts of information. The application is free, open-source, and runs on all major operating systems, making it a versatile and trustworthy tool for constructing a structured and easily navigable personal knowledge base.