Create Issue Branch - Automates the creation of issue branches on GitHub
Azendoo - Azendoo is a collaborative task management solution that helps companies to get work done easily and in teams.
REVISR - Git Management for WordPress : keep track w/ version control
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
StickyList - Your throwaway sticky note for your daily tasks. Digitized.
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.