Open source. Open possibilities.

Logseq is a privacy-first, open-source knowledge management and collaboration platform designed for organizing notes and managing tasks.

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

PlainApp is a free, open-source Android application that transforms your phone into a self-hosted management hub accessible via a web browser on the same local network.

Self-hosted Telegram bot that turns an Obsidian vault into a personal AI agent: capture text, voice, photos and links, then file them as markdown, kanban tasks and a finance ledger. Modules (planning, knowledge, finance) are fail-closed and can be disabled entirely.

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

Floral Notepaper is a lightweight cross-platform desktop note-taking tool built with Tauri 2 and React, featuring Markdown editing and preview capabilities.

Joplin is a free, open-source, privacy-focused note-taking and to-do application that supports Markdown and cross-platform synchronization.

A minimalist, native macOS note-taking app built with SwiftUI, featuring plain-text editing, hierarchical folders, smart autocomplete, spellcheck, and customizable cursor settings.

AppFlowy is an open‑source, AI‑enhanced workspace that serves as a Notion alternative. It offers cross‑platform native apps (desktop, iOS, Android), self‑hosting, and full data control, built with Flutter and Rust.

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.

Memos is an open-source, self-hosted note-taking tool designed for quick capture of short-form thoughts in a chronological Markdown timeline.

Open Notebook is a self-hosted, privacy-focused alternative to Google's Notebook LM. It organizes PDFs, videos, audio and web pages into notebooks, supports 18+ AI providers, and offers context-aware chat, search, and multi-speaker podcast generation.

SiYuan is a privacy-first, self-hosted personal knowledge management system with block-level references, Markdown WYSIWYG editing, SQL queries, spaced repetition, and AI writing via OpenAI API. It offers desktop, mobile, Docker deployment, and a built-in CLI.

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.