I am looking for a tool for Windows. It must allow comparing at least 3 text blocks. Any recommendations?
Update: 4 or more files at the same time is even better
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Meld allows three-way comparison of files.
It is free and open source. There is an installer for Windows. Not that you need it, but others stumbling on this question might be interested in other platforms: It can be installed using the package manager on common Linux distributions; and though Mac isn't officially supported, there are some installers available for it anyway.
kDIFF3 will, as its name suggests, allow you to diff 3 files.
It is free, open source, well supported and :