If you're on OS X I recommend gitup. Very fast and clean. Although if I remember correctly, it does ask for an email address.
My team's been using https://rowanj.github.io/gitx/ which has been a godsend - many of the same features, including interactive diff staging and tree view, in a native-feeling Mac interface. But that gitup screencast, how it makes rebasing painless - that's like nothing I've seen before. I'll definitely give gitup a try.
In general, these types of interfaces are VERY useful for junior programmers who aren't used to thinking of Git as a digraph of commits. I'm surprised that they're not used more often in online courses and bootcamps... maybe not enough people know about them yet!
There are a lot of ways to do git. If you frequently find yourself needing a GUI tool to do more than compare diffs (there are a few good ones out there), it's very possible that the way you / your team are using git could itself use some work.
If you're very new to git on teams or even if you're more intermediate, https://www.atlassian.com/git/tutorials/comparing-workflows/... is probably worth a read to understand how this stuff can work nicely for projects. It really shouldn't be rocket surgery to cut a new release :)
GitHub's site is not really convenient for me, the notifications aren't very useful, it generally feels like a clunky way to work.
If GitHub were smarter, they could have become the Slack of development. There's so much room for improvement there.
It hasn't asked me for email (the only email it has is for `user.email` git config)