When you hear the name Comodo, security Antivirus and Firewall are the things that comes to ones mind but yes they do offer Online backup solutions and as a by-product I think they have given a free version of a fully functional Backup software for Windows. Comodo backup software works in Windos 7, Windows Vista and Windows XP (haven’t checked the earlier versions).
HashTab is a simple free utility that provides Windows extensions to calculate file hashes. HashTab supports many hash algorithms such as MD5, SHA1, SHA2, RipeMD, HAVAL and Whirlpool. While there are many tools around to perform Hash checks, HashTab propably does it the most simple and easy way. It adds a simple tab to the File properties (and hence the name I assume).
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PeaZip is a free flexible opensource File and Archive Manager for Linux and Windows. PeaZip can create 7Z, ARC, BZ2, GZ, PAQ/LPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP archives and can extract upto 87 types of archive including all the mainstream popular archive formats.