Sprintly also has awesome Github integration, but they are explicitly NOT a front-end for Github Issues, so works best with private repos for larger teams (imho). They integrate well with Github, not necessarily Github Issues (a slight, but key difference).
TaskTub: http://www.tasktub.com/authentication/login Waffle.io: https://waffle.io/ BugHub: http://bughubapp.com/ (though since abandoned?)
Sprintly also has awesome Github integration, but they are explicitly NOT a front-end for Github Issues, so works best with private repos for larger teams (imho). They integrate well with Github, not necessarily Github Issues (a slight, but key difference).