I'm working on a presentation advocating for creatives to adopt #Git. The short version is that commits on a markdown document are a better system than Final_forrealthistime_noactually_v7.docx

So I need a really simple Git GUI (I taught some of these people about alt-tab yesterday). It should be easy to see all commits on the current and ideally other branches, to compare the working tree to any given commit, and to create and merge branches. Work tree support is a bonus. Any suggestions?