GitHub is great for software teams, but it does not support resource forecasting and time tracking. The browser extension allows you to manage start / end dates (required to forecast resources), as well as and track time . . . all without having to leave GitHub.

In GitHub:

In Roadmap:

Here's how the Roadmap team uses GitHub internally:

Related articles:
GitHub Integration (set-up)
Download and Configure Chrome, Firefox & Safari Extensions
Help, the Extension "®" is Missing!