I use WinMerge to compare text files, usually alogn with TortoiseSVN.
It is pretty good. The only thing which is inconvenient for me is very rough line comparison.
For instance, if I have two long lines without spaces and the only symbol is different in two string, WinMerge colors these two lines in the same color.
I want the similar tool as WinMerge (free, under Windows), but with more fine grain line comparison.
E.g. if I have old line
and new line
I want 0 and 1 be marked separately from the rest of the text.
Does exist something like this?