Md5-service is a project mainly written in Ruby, it's free.
Micro-service to generate md5 checksums
h1. md5-service
This micro-service allows you to post a url that points to a file. The service will then download that file, run it through md5sum and return the checksum.
Example:
This would generate md5 checksum for the content of the "original" datastream in a Fedora object with pid chagneme:20
http://localhost:3000/md5?url=http://localhost:8983/fedora/objects/changeme:20/datastreams/original/content
h2. Known Issues
h2. Acknowledgements
Created by "Bill Ingram" https://github.com/waingram