IGit is a tool for managing pull requests. It works with GitHub's API and provides mechanisms for keeping you in the loop. Stop checking your PRs over and over again from top to bottom. IGit will give you the feel of control because it shows you exactly what's new.
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That was always an issue for me. I am working actively on three repositories and have to changes pages all the time. If not that I have to keep bunch of tabs open which is a little bit frustrated for a person that loves to have just a few opened.
I bet it happens to you every day - you open a pull request, you review it and then some changes comes in. You have to again scan the PR, the comments and the new commits to understand what is actually new. IGit remembers what you checked and compares it to the incoming events. Then it sets a red marker on the new stuff. You are free to leave them unseen which I'm very often doing as a reminder that I have some work to do.
Although there are bunch of things which I'm missing in GitHub's UI it still provides some slick interaction patterns. I mimic most of them here in IGit.