1. HashCheck Shell Extension

Open Source checksum/hash creator and verifier for Windows (shell extension). It supports .sfv, .md4, .md5 and .sha1 file extensions. I use it and I am satisfied with it. Visit HashCheck!

2. FreeCommander

...  Copy, move, delete, rename files and folders Wipe files Create and verify MD5 checksums File splitting File properties and context menu Calculation of folder size Folder comparison / synchronization ...