Dudle - Dudle is an online scheduling application, which is free and open source.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
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.
Framadate - Make your polls
Basecamp - A simple and elegant project management system.