It's a bit of a red herring... The boomtree server is written in Lisp, but it implements a new language called bdf that the R2P app (and the whole server) are built in. All of the bdf code is viewable at the site. To see the source for the Redstone2Phone page, see:
https://boomtree.com/r2p/Sandbox?post_target=Stamps&view_mod...The editor you see there is also bdf, also viewable and editable at the site.