Slidepad - iPad style multitasking on your Mac
Nifty - Manage projects, work, and communications in one place.
Magnet Window Manager - Magnet Developers
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.
Better Window Manager - A tiny window management app for the Mac
Flow - Stop managing projects from your inbox.