MD5 Checker is a free and small, easy to use, simple program to calculate the MD5 checksum of files.
Building from source: Unarchive, open a Terminal window, go to MD5 Checker`s directory in the src folder and from there run the following command: qmake
Then double click the generated Xcode project and choose Build from the Build menu in Xcode. This will build MD5 Checker in the "/build/Debug" folder inside the source directory.