Task Management

Wine - Work on Mac? Has all sorts of other features that seem great (charts, kanban, etc.)

Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists. It is designed for composite tasks, and also offers effort tracking, categories, notes and more.

Go For It! is a simple and stylish productivity app, featuring a to-do list, merged with a timer that keeps your focus on the current task.

A simple task manager app, allowing you to categorise your todo list by urgency, state, timeframe etc.

Wekan, formerly LibreBoard, is an open-source and collaborative Trello -like kanban board application.

Maybe - Mac App Store, currently developed 200521

Kanboard is a free and open source Kanban project management software.

Redmine is a flexible project management web application. Written using Ruby on Rails framework, it is cross-platform and cross-database.