Open-source Markdown editor on Mac, Windows, and Linux offering real-time preview, clean interface, and various themes. Supports math expressions, exports HTML/PDF, allows image pasting, and more.




TreeTime is described as 'Lets you organize notes, tasks, and projects using linked hierarchical trees. Perform recursive calculations on your data and explore your information visually through a lightweight, view-only local web interface — all while keeping your data private and portable' and is a todo list manager in the office & productivity category. There are more than 100 alternatives to TreeTime for a variety of platforms, including Windows, Mac, Linux, Web-based and Android apps. The best TreeTime alternative is Obsidian, which is free. Other great apps like TreeTime are Joplin, ONLYOFFICE, Logseq and Anytype.
Open-source Markdown editor on Mac, Windows, and Linux offering real-time preview, clean interface, and various themes. Supports math expressions, exports HTML/PDF, allows image pasting, and more.




A note-taking tool that gives you memory superpowers. It automatically generates flashcards from your notes and figures out the optimal time to practice each flashcard.



DeepNotes is an open source, end-to-end encrypted visual note-taking app with deep page navigation and live collaboration. Create mind maps, diagrams, kanban boards, among others. Infinite nesting of infinite canvases.




Reor is an AI-powered desktop note-taking app: it automatically links related ideas, answers questions on your notes and provides semantic search. Everything is stored locally and you can edit your notes with an Obsidian-like markdown editor.

Open-source tool merges spreadsheets, databases, and app-building. Offers a spreadsheet interface, Python engines, real-time collaboration, and cell-level security controls. Choose cloud or self-hosting to maintain data ownership, free team account offers available.




Dendron is an open-source, local-first, markdown-based, note-taking tool built on top of VSCode. It supports all the usual features you would expect like tagging, backlinks, a graph view, split panes, and so forth.



Foam is a personal knowledge management and sharing system inspired by Roam Research, built on Visual Studio Code and GitHub.

Tomboy is a desktop note-taking application for Linux, Unix, Windows, and Mac OS X. Simple and easy to use, but with potential to help you organize the ideas and information you deal with every day.



TheBrain helps you organize all your Web pages, contacts, documents, emails and files in a context-driven visual map.




Craft offers document creation with stunning visuals, seamless navigation, and effortless sharing. Nest notes, use AI for summaries, and export in multiple formats.




Secure device-synced notepad using AES-GCM-256 encryption to protect confidential data. Features include a tree-structure for note organization, historical changes tracking, and collaboration options. Supports all major platforms with cloud sync and offline access.




Nuclino is a unified workspace where teams can bring all their knowledge, docs, and projects together in one place. It’s a modern, simple, and blazingly fast way to collaborate, without the chaos of files and folders, context switching, or silos.


