The best open source alternative to MyTetra is Notesnook. If that doesn't suit you, our users have ranked more than 100 alternatives to MyTetra and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to MyTetra are Zim, TiddlyWiki, CherryTree and Trilium Notes.
Offers open-source, end-to-end encrypted notes with device-based privacy, cross-platform support, private vault, secure sync, offline access, markdown editor, exports to multiple formats, automatic backups, organizational tools, and strong encryption.
Zim brings the concept of a wiki to your desktop. Store information, link pages and edit with WYSISYG markup or directly typing some lightweight markup syntax and see it previewed as-you-type. Creating a new page is easy by either clicking on the "Create new note"...
TiddlyWiki is a single html file with all the characteristics of a wiki - including all of the functionality (including editing, saving, tagging and searching) and the style sheet. Because its a single file, its very portable - you can email it, put it on a web server or share...
Hierarchical note-taking software that is free, open-source, cross-platform. Features include rich text, syntax highlighting, multi-level lists, embedded files, customizable interface, code execution, PDF export, spell check, images & tables, and comprehensive project management support.
The original trilium is transfered to this repo by its owner and the app continues to develop here as stated here: https://github.com/TriliumNext/Trilium
Encrypted, privacy-focused digital storage with zero-knowledge architecture supporting document editing, notes, journals, and photo storage with raw DSLR support, live sync, markdown, code, LaTeX, to-dos, audio, tables, EPUB, PDF, and cross-platform access.
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.
RedNotebook is a graphical diary and journal helping you keep track of notes and thoughts. It includes a calendar navigation, customizable templates, export functionality and word clouds. You can also format, tag and search your entries.
wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information.
KeepNote: note-taking and organization. KeepNote is a note taking application that works on Windows, Linux, and
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