Prime Time Freeware (PTF) includes Modula-3. PTF is a set of two ISO-9660 CDroms filled with 3GB of freeware, issued semi-annually. PTF is distributed via bookstores and mail. You can reach PTF using:
Email: firstname.lastname@example.org Fax:  (408) 738 2050 Voice:  (408) 738 4832 Mail: Prime Time Freeware 415-112 N. Mary Ave., Suite 50 Sunnyvale, CA 94086 USA
Many Linux CDroms include a copy of the FTP site tsx-11.mit.edu which has Linux binaries for Modula-3.