Riter - Project management & team collaboration tool
QritiQ.me - A community for designers to share and learn
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.
Sidebar Webring - A collection of handpicked blog feeds focused on design
Confluence - Confluence is content collaboration software that changes how modern teams work
Ocean - A Community of designers sharing feedback