TupiTube ( also known as Tupi 2D) is a free and open-source 2D animation software that is focused on usability for children, teenagers and amateur artists.
QOwnNotes
Modern, minimal GUI app for libinput-gestures
CoolReader
Cross platform open source e-book reader.
QOwnNotes
Simple backups based on borg
Featherpad
FeatherPad is a lightweight Qt plain-text editor for Linux.
QOwnNotes
Compare images and videos
Kate
Kate is a multi-document, multi-view text editor by KDE. It features stuff like codefolding, syntaxhighlighting, dynamic word wrap, an embedded console, an extensive plugin interface and some preliminary scripting support.
Liri text
Liri Text is a cross-platform text editor made in accordance with Material Design.
QOwnNotes
This program is an audio-player, written with the help of the Qt library. The user interface is similar to winamp or xmms.
Marker
Marker is a simple yet robust markdown editor for the linux desktop.