Zube - Project management for developers.
Matrify - Manage information in tables.
Digital Assistant - Issue Manager - Create issue, List issues, Close Issue, Issue Coordination, Issue Analytics, User Perfromance Metrics.
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.
Nifty - Manage projects, work, and communications in one place.
Huboard - HuBoard is built from the ground up using the GitHub public API.