(GTG) is a personal tasks and TODO-list items organizer for the GNOME desktop environment … https://www.tromjaro.com/gtg/
Topsi
A Desktop Kanban board app. … https://www.tromjaro.com/topsi/
Open ToDo List
A simple Todo and task management application … https://www.tromjaro.com/open-todo-list/
Zettlr
A Markdown Editor for the 21st Century … https://www.tromjaro.com/zettlr/
Agenda
A simple, fast, no-nonsense to-do (task) list.
… https://www.tromjaro.com/agenda/
Joplin
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. … https://www.tromjaro.com/joplin/
Knowte
Cross platform note taking application … https://www.tromjaro.com/knowte/
FeatherNotes
Lightweight Qt5 Notes-Manager for Linux
… https://www.tromjaro.com/feathernotes/