MixMaster remailer source

A little while back when the "remailer crisis" discussion was in full swing, L. McCarthy recommended the Mixmaster remailer as being the most modern. After several days of hunting, I have utterly failed to turn up the source to this remailer. Can anyone provide me a pointer? On a slightly related note, is there a validation suite for PGP? The MIT distribution does not include OS/2 binaries, unfortunately, but I have managed to get a clean build. It seems to work, but I simply don't know enough about PGP to be sure that it really is a fully working verson. Kevin At Intel, quality is job 0.999731.