Simple Online Planning
Easy to set up bug tracking with Java
sleek is a todo.txt manager, free and open-source (FOSS)
Easy-to-use personal time tracking application for Windows and Unix
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
WeekToDo is a Free and Open Source Minimalist Weekly Planner and To Do
Small Business Appliance
IGSuite is a web-ajax-based Integrated Groupware Suite
Collabtive is web based project management software. Simple and easy.
PWM let you organize your project in a Web 2.0 way.
Entorno Colaborativo
A very simple to do list
PHP & MySQL/SQLite -based Project Management System
Plugin to allow search from multiple Freemind maps
Open Source, tasks, bug tracking, agile scrum, timesheet, wiki
A GTD-inspired ToDo list manager that tells you what to do next!
Plan4Action is a task and project manager
a scrap paper for android.
a java based sticky notes
Take notes, set your to dos,and manage your calendar all on a terminal
A personal Getting-Things-Done extension for MSOutlook and MSOneNote.