[pjc50]

I could actually do with this for Windows; alternatives to "git gui" and TortoiseGit?

[IshKebab]

SourceTree is good but slow. Tower and SublimeMerge are very good and fast but they are commercial. I think Tower might be free for personal use.

On Mac I use GitX which is a little buggy but I think it has the most logical UI. Sadly it isn't cross-platform.

GitAhead is also worth a look - it was a commercial one but is now open source.