Software/algorithm for swiss tournaments to balance out how often each player plays white/black?

I'm looking for a software/algorithm for swiss-style tournaments that determines who plays white/black each match to balance out how often each player plays white or black as well as possible. I know there is something like that for round-robin tournaments de.scribd.com/document/420831582/pairrrs

www.google.com/search?q=swiss+tournament+open+source
should gives at least two opensource thingies that have also the W/B part

@petri999 said in #2:
> www.google.com/search?q=swiss+tournament+open+source
> should gives at least two opensource thingies that have also the W/B part
Ayy yes thank you mister master :)