VSO Inspector - VSO-Inspector is a free add-on to report various information about your hardware configuration.
RapidCRC Unicode - RapidCRC is an open source CRC/MD5/SHA hashing program.
CDCheck - CDCheck can check each of your CDs and DVDs and indicate which files are corrupted.
Md5Checker - Md5Checker is a free, faster, lightweight and easy-to-use tool to manage, calculate and verify MD5 checksum of multiple files/folders.
Isobuster - Low cost utility to recover data from damaged, scratched, or otherwise defective discs.
HashMyFiles - HashMyFiles is small utility that allows you to calculate the MD5 and SHA1 hashes of one or more files in your system.