Visual Studio Pro & up has a great feature that puts a tiny snippet of text above each class & method that says the last author, how many authors & how many changes have been done on that specific class or method. You can hover over this text and see a box with a scroll bar that shows you the commits & comments that changed the class or method.

I'm not sure if any other IDE or editors have this but I really love this feature as a method of documentation. I'm not saying it is the best method or the only method one should use, just a useful method that I wish more IDEs & editors had.