Open source note taking and to-do app with synchronization
A free, open-source, and completely encrypted notes app
All your favorite services in one place
sleek is a todo.txt manager, free and open-source (FOSS)
IGSuite is a web-ajax-based Integrated Groupware Suite
Small Business Appliance
WeekToDo is a Free and Open Source Minimalist Weekly Planner and To Do
a free mind mapping tool, to especially assist decision making
Open source project management
A meter-based to-do list
Kue is a priority job queue backed by redis, built for node.js
Kanban board en HTML portable
Collabtive is web based project management software. Simple and easy.
Unofficial Evernote client for Linux desktop
PHP & MySQL/SQLite -based Project Management System
Open Source, tasks, bug tracking, agile scrum, timesheet, wiki
Vimat Is More than A To-do list
Manage your tasks and improve your productivity
ComingNext is a calendar homescreen widget for the Symbian smartphones
Cosas is a web emulation of the GTD app Things