There was once a bit of a buzz surrounding HTML5 and AppGameKit (Or rather, the now abandoned Freedom Engine Project, which was essentially a web based AGK), but no more.
I'm sure the newer versions of AppGameKit work with Linux, but I am unsure how you would go about exporting to such. I would assume it would be akin to the Windows version, where it generates an executable and the bytecode file and leaves it up to you to package it in whatever installer you see fit?
Neither of these things are available for purchase as an add on, but there is a Feature suggestion board on this forum, so you could always ask for them.