Jira may be extremely sluggish and require a large amount of memory on the client side.
GITK - The GITK - Generalized Interface Tool Kit is a set of libraries, which form a (user) interface...
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Sublime Merge - Fast git client with integrated merge tool from the makers of Sublime Text
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.
OctoDroid - Mobile GitHub client for Android.
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.