Kate – free and open source, multiplatform and advanced text editor for KDE

FocusWriter – free and open source, multi-platform and simple word processor that allows you to write without distraction

Gedit – free and open source, simple and convenient, but powerful text editor for creating notes and programming from the GNOME project

ReText – free and open source, simple but powerful editor for Markdown and reStructuredText

Zim – free and open source, multi-platform graphical text editor for creating wiki pages

EncryptPad – free and open source, multi-platform minimalist secure text editor and tool for encrypting and decrypting binary files on disk

Zettlr – free and open source, fast and convenient, multi-platform Markdown editor for researchers in the arts and humanities