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.

GetBadges - GetBadges is a gamification platform which allows developers to play and compete while using software development tools.

hiTask - HiTask is a free shared task list for your team. The place to plan, organize, and stay in sync.

Orcaso - Work is now gamified. Achieve greatness through orcaso.io, the simplest project management/team collaboration tool.

Mail Pilot - Beautiful task oriented email client for Mac, iPhone, & iPad

Cooey - IoT enabled health management platform that works offline