Open source alternative to Notion. Supports macOS, Windows, Linux, iOS, and Android. AGPL-3.0 Flutter/Dart

A hierarchical note-taking app featuring rich text and syntax highlighting. GPL-3.0 Qt/C++

Free AI voice diary for iOS with on-device transcription, mood tracking, Digital Twin, and knowledge graph. 100%…

All-in-one note-taking solution for modern students and academics, powered by Rust with integrated AI. ? Rust/TypeScript

Open source markdown notes editor with integrated Git syncing. Supports iOS, Android, Linux, and macOS. AGPL-3.0…

PIM, IDE, and outliner that accelerates the work flow of programmers, authors, and web designers. MIT Python

Open source plain-text file markdown note-taking application with Nextcloud / ownCloud integration. GPL-2.0 Qt/C++

Open source desktop journal using plain-text files. GPL-2.0 Python/GTK

Local-first spaced repetition note-taking app for macOS with FSRS scheduling, Anki import, and study guides. GPL-3.0…

GNOME desktop note-taking application for Linux, Windows, and macOS. Original project abandoned; see tomboy-ng for the…

Free form data organizer using hierarchical spreadsheet. Zlib C++

Open source multi-platform desktop GUI to manage a collection of local wiki pages. GPL-2.0 Python/GTK

A markdown-based knowledge management tool with CLI and LSP server. Turns markdown files into a navigable graph with…

A terminal-native LifeOS for notes, linked tasks, schedules, events, and timelogs. Apache-2.0 Python

A command line and local web note-taking, bookmarking, archiving, and knowledge base application. AGPL-3.0 Shell

A simple and extensible shell script for managing your todo.txt file. GPL-3.0 Shell

A command-line tool helping you to maintain a plain text Zettelkasten or personal wiki. GPL-3.0 Go

A minimalistic note management solution powered by fzf. GPL-3.0 Shell

A fast, lightweight, terminal-based note-taking app for the modern developer. MIT Go

An open source, cross-platform, extensible, and customizable text editor. GPL-3.0 C/Emacs Lisp

An Emacs mode for quickly browsing, filtering, and editing directories of plain text notes, inspired by Notational…

Note-taking tool on Emacs that can be combined with any format. GPL-2.0 Emacs Lisp

Multi-level autonumbered hypertextual outliner for Emacs. GPL-3.0 Emacs Lisp

Concept mapping in Emacs using org-mode. Last commit 2023; appears unmaintained. MIT Emacs Lisp

Plain-text markup and major mode for keeping notes, authoring documents, computational notebooks, and literate…

Plain-text personal knowledge management system inspired by Roam Research. GPL-3.0 Emacs Lisp

A personal wiki for Vim — a number of linked text files with their own syntax highlighting. MIT Vim Script

A structured view of your plain-text notes. Successor to Neuron. AGPL-3.0 Haskell

VSCode plugin for personal knowledge management inspired by Roam Research. MIT TypeScript/VSCode

Next-gen knowledge base that brings planning, sorting, and creating all together. Privacy first, open-source,…

Open source local-first app for tasks, notes, and more with E2EE and cross-platform sync. Source-available…

A free alternative to Notion that takes markdown notes saved right on your computer. AGPL-3.0 Web/TypeScript

Open source personal website builder. GPL-3.0 Electron/JavaScript

Forget less by daily journaling, completely offline, secure, and free. Supports macOS, Windows, and Linux. GPL-3.0…

Local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base. AGPL-3.0…

Simple note-taking app based on VS Code Editor. No longer open source as of v1.6. Proprietary Electron/TypeScript

A privacy-first, self-hosted, fully open source personal knowledge management software. AGPL-3.0 Electron/TypeScript+Go

A free, open-source, and completely encrypted notes app for macOS, Windows, Linux, iOS, and Android. AGPL-3.0…

Local-first RAG knowledge base compiler with persistent markdown wiki, knowledge graph, hybrid SQLite FTS and…

An open source, local-first markdown note taking application designed to let you write the way you think. Apache-2.0…

Customizable personal knowledge-base with git as backup manager and blogging platform, based on TiddlyWiki. MPL-2.0…

Markdown editor for academics and researchers. GPL-3.0 Electron/TypeScript

Open-source AI notepad for meetings with flexible AI stack and on-device storage. GPL-3.0 Tauri/Rust+TypeScript

Portable Markdown editor with split view, live preview, themes, templates, focus mode, and diff viewer.…

Instant thought capture for macOS. Global hotkey summons a post-it note, type and close. Notes stored as plain…

Open-source and local-first, encrypted note-taking application organized in tree-like structures. AGPL-3.0 Tauri/Rust

The free software version of HackMD. See HedgeDoc for the active community fork. AGPL-3.0 Web/JavaScript

Open-source collaborative wiki and documentation software. Notion/Confluence alternative with real-time collaboration.…

A simple to use and highly versatile open source wiki software that doesn't require a database. GPL-2.0 Web/PHP

A Markdown paper for daily todo and thoughts. Privacy first, OSS, local-only. MIT Web/TypeScript

Self-hosted, database-less, plain-text markdown note-taking app. MIT Python/Vue

Source control software with built-in standalone wiki pages. BSD-2-Clause C

Real-time collaborative markdown notes. Community successor to CodiMD. AGPL-3.0 Web/TypeScript

Annotate anything online. BSD-2-Clause Web/Python

Open source note taking app that supports synchronization with E2EE. Available on Windows, Linux, macOS, iOS, Android,…

Evernote-like note-taking web application with a Markdown editor. Abandoned since 2018. MPL-2.0 Web/JavaScript

Lightweight, self-hosted memo hub. Privacy first. MIT Go/React

A free, open-source browser extension to take time-stamped YouTube notes. GPL-3.0 Browser Extension/JavaScript

Open-source app for managing plain-text notes in Zettelkasten style. Superseded by Emanote. AGPL-3.0 Haskell

Fully open source and end-to-end encrypted note-taking app available on all platforms. GPL-3.0 Web/TypeScript

Fast, collaborative team knowledge base. Self-hosted or cloud. BSL-1.1 Web/TypeScript

Free, open-source self-hosted PWA for markdown notes. MIT TypeScript/Go

Minimalistic private note-taking app with focus on typography. MIT Web/TypeScript

A self-contained JavaScript wiki for the browser, Node.js, AWS Lambda, and more. BSD-3-Clause Web/JavaScript

Beautiful, flexible writing app for notes and prose. Apple platforms only (Mac, iPhone, iPad). Sync via iCloud with…

Object-based note-taking app for networked thinking. Available on macOS, Windows, Linux, web, iOS, and Android.

Beautiful native document editor for Mac, iPad, iPhone, Android, and Windows with real-time collaboration.

macOS and iOS app for storing, organizing, and working on documents and notes.

An app designed for note-taking, organizing, task management, and archiving of different formats.

Google Keep is a note-taking service developed by Google. Available on the web and as a mobile app.

Helps developers write better documents and build active communities with open collaboration.

Visual note-taking tool for learning complex topics, with whiteboard-based card organization.

An app for organizing Markdown notes with E2EE sync. Available on macOS, Windows, Linux, iOS, and Android.

Voice journal and note-taking over a phone call. Exports to Markdown and Notion.

(GitHub) - Portable offline Markdown editor for Windows using WebView2, with live preview, dark mode, KaTeX math, and…

AI-powered self-organizing workspace for notes and knowledge. Available on web and iOS.

Note app for busy minds with AI search and smart organization. iOS available, Android coming soon.

A Cursor-like AI workspace for deep and focused personal knowledge management.

Mobile, web, and desktop app to take multiple forms of notes, from Zoho.

Combines tasks, notes, and calendar all in one place. Available on Mac and iOS.

All-in-one workspace for notes, docs, wikis, projects, and collaboration.

Free for personal use app that works on top of a local folder of plain text Markdown files. Optional E2EE sync via…

A fast, lightweight tool for writing, planning, and organizing in Markdown that stays yours.

An AI-first note-taking app that auto-organizes notes into searchable cards. Website unreachable; status unclear.

Microsoft OneNote is a program for free-form information gathering and multi-user collaboration.

An integrated reading environment to build your knowledge base. Website unreachable; appears abandoned.

Fast, AI-powered note-taking app with end-to-end encryption. Available on Mac, Windows, web, and iOS.

A note-taking tool for networked thought.

Chrome extension and macOS menu bar app that saves any webpage as clean Markdown to a local vault, with a built-in MCP…

Available for iOS, Android, macOS, Windows, Linux, and the web. Supports Markdown.

Record and save important information, ideas, and moments. Available for multiple platforms.

Android app to take digital handwritten notes for class, work, or fun. Markup PDFs and sign documents.

A multi-platform notes app built around markdown notecards and card nesting with real-time collaborative features.

Supertag-based knowledge tool with powerful structuring and AI-meeting features.

A tree-structured note-taking and productivity app with real-time collaboration, AI agents, and multiple views.…

Mind mapping and personal knowledge base software application.

Premium writing app for Mac, iPad, and iPhone with Markdown support. Apple platforms only.

Web-based organizational tool to create todo lists, notes, team projects, and more.

Web service to organize and improve ideas and notes by sharing with friends. Website appears dead.

AI note taker, focus on meetings and online lectures without bots. Available on Mac.

Free for personal use app that works on top of a local folder of plain text Markdown files. Optional E2EE sync via…

Open source note taking app that supports synchronization with E2EE. Available on Windows, Linux, macOS, iOS, Android,…

Local-first, non-linear, outliner notebook for organizing and sharing your personal knowledge base. AGPL-3.0…

A privacy-first, self-hosted, fully open source personal knowledge management software. AGPL-3.0 Electron/TypeScript+Go

Next-gen knowledge base that brings planning, sorting, and creating all together. Privacy first, open-source,…

Open source alternative to Notion. Supports macOS, Windows, Linux, iOS, and Android. AGPL-3.0 Flutter/Dart

A free, open-source, and completely encrypted notes app for macOS, Windows, Linux, iOS, and Android. AGPL-3.0…

Open source local-first app for tasks, notes, and more with E2EE and cross-platform sync. Source-available…

Fully open source and end-to-end encrypted note-taking app available on all platforms. GPL-3.0 Web/TypeScript

Wiki

Plain-text markup and major mode for keeping notes, authoring documents, computational notebooks, and literate…

All-in-one workspace for notes, docs, wikis, projects, and collaboration.

An app designed for note-taking, organizing, task management, and archiving of different formats.

Google Keep is a note-taking service developed by Google. Available on the web and as a mobile app.

Microsoft OneNote is a program for free-form information gathering and multi-user collaboration.