I really love TortoiseMerge (TortoiseSVN's diff/merge software). I can download it standalone as a zip, but I really love when I can select two files and then right click and from the context menu click on "diff in tortoise". Is there any way I can install just this tool? I don't want the whole SVN suite.
TortoiseSVN's download page does not offer TortoiseMerge individually.
Here are TortoiseMerge's official webpage and documentation.
You can't, sorry. Yes, you can!
According to this forum thread (from June, 2011, so pretty much over three years old), written by Stefan Küng, an author of TortoiseSVN, starting from version 1.7 of TSVN, TortoiseMerge does not ship as standalone.
You can go to Tools folder on TortoiseSVN's site at SF and get TortoiseDiff-1.6.7.zip file from there. It still quite outdated (see above notice), but certainly it is a standalone version of TortoiseMerge.