Here are some great places to pick up old mac software and also a guide to setting up an AFP server on ubuntu as a gateway between OS X and the ‘old world’ macs.
http://obsolete.macfixer.com/vintage-software/
http://macos9lives.com/smforum/index.php/board,62.0.html
https://download.cnet.com/Apple-Scanner-Software-Update/3000-2118_4-10006287.html