Organizers

Errands is an application for simple task list management. A free and open source program

Planify is a task tracking program with Todoist and Nextcloud support for Linux. A free and open source program

AppFlowy is a privacy-oriented workspace for notes, tasks, databases and more. Free and open source program

Agenda-dahenson is a free and open source very simple task manager to help you keep track of the tasks that matter most

CoreTime is a free and open source very simple clock/calendar application that supports alarm clock, reminders, has a stopwatch and timer

Reminduck is a free and open source simple reminder app

sleek is a free and open source, multi-platform task management program that uses todo.txt format

Super Productivity is a free and open source, cross-platform program for creating to-do lists and time tracking with integration of Jira, Github, and Gitlab