I’m working on this for a client: Comparing Kanban project management apps that have very good GitHub integration. So far I’ve looked at Huboard, Waffle, Zenhub, and Blossom.
Blossom.io is the strongest for our needs due to the detailed cycle time reporting, showing where cards are spending their time. It also has some very useful project management features like marking an issue as “blocked” or “ready” for moving to the next stage.
Online at Google Docs