Alpas - Manage your team's work, projects & tasks online for free.
Azendoo - Azendoo is a collaborative task management solution that helps companies to get work done easily and in teams.
Freelancer Stack - Curated directory of tools used by 10,000+ freelancers
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.
CodeGophers - Your personal army of programmers
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.