From Implbits :
Fast and Simple. Users in over 200 countries have downloaded HashTab to use as a simple MD5 checker or for a more advanced file integrity check.
HashTab provides OS extensions to calculate file hashes and supports many hash algorithms such as MD5, SHA1, SHA2, RipeMD, HAVAL and Whirlpool. It provides an easy drag and drop interface to simplify the process of comparing two files. In addition to comparing files, Hashtab is commonly used to vet the integrity of a file downloaded from the internet. With a global community, Hashtab is currently translated into 27 languages and counting.