Anime checker is a portable tool that verifies the integrity of your files. It calculates the CRC32 of your files and compares it with the one found in the filename. Useful with fansubbed animes.
Fsum Frontend is a files integrity checker. It can calculate 96 hash and checksum algorithms(CRC32, MD5, SHA1, SHA2, ADLER, DHA256, FORK256, ...). You can verify your files using a .sfv/.md5/.sha1/.sha2 file or create your own checksum file.