How to compare two source trees for differences/changes on win32?

Question

There are two directories with source trees. What is the best software to reveal changes in them. The should be not only file names but also some file-comparison viewer. It could be better if it is free tool. Thanks

Answer 1

I've used windiff for quick checks. it's not incredibly sophisticated, but it does the job.

Answer 2

Beyond Compare by http://www.scootersoftware.com/

Answer 3

Beyond Compare - paid but worth it.

Answer 4

WinMerge, While not quite up to Beyond Compare, it's close and it's open-source.