HashMyFiles - Easy to use Windows GUI tool. Supports various hash types.

multisum - WIP and mostly untested python tool that supports multiple ROM-specific output formats and can record information on files and folders recursively. Supports CRC32, MD5, SHA1 and SHA256 hash types.

clrmamepro - Windows GUI tool with a “dir2dat” function that can process a directory recursively and output a Logiqx datfile. A bit limited and difficult to use. Supports CRC32, MD5 and SHA1 hash types.