Open source. Open possibilities.

Trilium Notes is a free, open-source, cross-platform hierarchical note-taking application designed for building large personal knowledge bases.

jrnl is a simple command-line journal application for creating, searching, and viewing journal entries stored as plain text.

Standard Notes is an end-to-end encrypted note-taking application designed for secure cross-platform synchronization across unlimited devices, with options for self-hosting and extensions.

Beaver Notes is a local-first, markdown-native note-taking application for desktop and mobile that prioritizes user privacy and data ownership.

Parker is a minimal, keyboard-first macOS menu-bar editor for notes, code and Markdown, built on Tauri with React and CodeMirror. It works on a plain folder of files you own, with aggressive auto-save and optional built-in git backup for versioning.

Tisty is a local-first, open-source productivity tool for Windows and macOS that combines notes, documents, and task management. It stores all data as plain Markdown files on the user's disk, ensuring privacy with no accounts, subscriptions, or telemetry. Features include an Eisenhower matrix for prioritization, natural language date parsing, and MCP integration for AI assistants.

AFFiNE is an open-source, privacy-focused workspace that merges documents, whiteboards, and databases into a single local-first platform for knowledge management and planning.