Hmm, I don't even know what soundfonts are... you know of any other good ones that do have that?
Most important thing seems to be it doesn't claim any copyright over your work, so it should be alright to submit elsewhere too, a lot of these tools aren't as accepted elsewhere/have some issues with that.
Cyberdevil
Woo this is awesome, and BeepBox seems awesome, never heard of that before...
BumbyJumby
Yeah, it’s pretty darn good for being a midi maker website. Sucks you can’t add any soundfonts though…