Slidepad - iPad style multitasking on your Mac
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.
Magnet Window Manager - Magnet Developers
Slack - A messaging app for teams who see through the Earth!
Better Window Manager - A tiny window management app for the Mac
GrowthList - A crowd-sourced list of growth hacks