Inverse - Team conversations and knowledge sharing on any webpage
Azendoo - Azendoo is a collaborative task management solution that helps companies to get work done easily and in teams.
Client Proofing by Pixpa - Share, proof and deliver your work to clients.
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.
Outpost - Collaborative email designed for teams.
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.