Zube - Project management for developers.
Nifty - Manage projects, work, and communications in one place.
Client Portal - A client-friendly way to keep your projects organised
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.
Party Line - Use Slack to manage your projects
Board for Github - A webview based GitHub project app with native features