ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Nullboard - Minimalist locally-stored kanban board / task list manager.
Intercom on Product Management - The ultimate resource for aspiring product managers
Huboard - HuBoard is built from the ground up using the GitHub public API.
Zenkit Projects - Plan. Act. Smile.
Zube - Project management for developers.