VCF vcard, XML xcard, JSON jcard;View, Edit, Convert, Export, CSV, QR
Freeplane add-on for task management and memo taking
The Freeplane add-on that syncs a GTD mind map with a todo.txt file
Prayer Times for iPhone and Android built-in Calendar
Microsoft Excel add-in used to shorten repetitive tasks.
Outlook macros for implementing GTD
Pomodoro technique for Outlook
A personal Getting-Things-Done extension for MSOutlook and MSOneNote.