So even in 2013, someone is considering the 6502 to be worthy of quite a bit.
I preferred the Z80 end of things, but to each his own. History has proved the 650x line to be the better.
But at least you can still get a Z80 from Digikey!
Just take a look. 6502 search: stock availble : 0! Z80: 44!
In any case, here is the repo link:
https://github.com/contiki-os/contiki/tree/master/platform
Look at all the fun. Browser, VNC server, ftp server and client....
Atari, C64, C128... The fun is in finding one of the more rare systems :-)