MD5summer is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is fHash, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to MD5summer and four of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to MD5summer are checkSum+ (Free), Jacksum (Free, Open Source) and Hashsum (Free).
Jacksum is a free and platform independent software for computing and verifying checksums, CRCs and message digests (known as hash values and fingerprints). "Jacksum" is a synthetic word made of JAva and ChecKSUM.
Concerned with file integrity? Hashsum has your back! Hashsum is an easy-to-use drag and drop tool, that quickly lets you look-up the checksum for any file. It currently supports the commonly used MD5, SHA1 and SHA256 encryption algorithms.