Wikipedia
eProductivity is a software tool designed to help users of IBM Lotus Notes implement David Allen's Getting Things Done (GTD) methodology, reinforce the best practices of GTD, and enhance the behavior of the IBM Lotus Notes PIM applications (Mail, Calendar, Contacts, To Do) to better support the GTD approach.
The eProductivity software itself is a pair of application design templates for use with IBM Lotus Notes 6.x and later. These templates are applied to the user's Mail database and Notebook database and are designed to improve usability and add new functionality.
David Allen was personally involved in the design, testing, and vetting of eProductivity.
eProductivity is also the name of the company founded by Eric Mack for the purpose of marketing and selling the eProductivity software.