Hi Christian,
agreed it is a beautiful tool. I have no experience with MACs but i have googled up this list:
http://www.dontcrack.com/freeware/so.../platform/mac/
These look usable:
http://www.dontcrack.com/freeware/do...Crayon-Filter/
http://www.dontcrack.com/freeware/do.../Delta-Series/
http://www.dontcrack.com/freeware/do...re/Filterizer/
etc.