If you want to host your BYOND libraries/demos/games look at http://walagata.com/
It says it gives you about one meg of space, but it let me upload my game which is about 1.8 megs.
"You cannot upload any more files until you free up more than 845,798 bytes worth of space.
Your account currently holds 1,845,798 bytes, and your account maximum is 1,000,000 bytes."
Anyhow, enjoy =)