Doit.im - Doit.
Sortd - Rated the #1 App for Gmail
TaskUnifier - TaskUnifier - Task Management Application
KanbanMail - A Kanban board for your emails.
The Hit List - Your life is complicated, but managing it doesnt need to be.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.