TextPad - TextPad is a powerful, general purpose editor for plain text files that is easy to use, with all the features a power user requires.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
TiddlyWiki - a non-linear personal web notebook
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Falcon - Ultraportable 2-in-1 Laptop
Boostnote - Boostnote is an open-source note-taking app.