Or you can browse the applications we already host. We're currently only suporting Python, because secretly we're just running the development SDK behind this glorious facade. As soon as Google releases Javascript or Ruby support, you can bet we'll be on it like dogs on bacon.
Confidence builder: AppDrop is a proof-of-concept, to show that Google's App Engine platform can be ported to other hosts. Unlike Google's project, we make no claims to be able to scale beyond a small amount of traffic. We reserve the right to shut the whole thing down at any time. We're running on EC2, so our virtual machine could just disappear. We hope you enjoy AppDrop.
Use at your own risk! Our current implementation makes no claims to be a finished product. For that reason, we're doing the simplest thing that could possibly work on most fronts. We've pretty much ignored security concerns, so for the time being please don't upload any applications that deal in sensitive data. Also, we've yet to enable email support. The source code is available, so if email support, database scaling, or more secure logins are important to you, you have the ability to implement them yourself.
(We've made one enhancement over and above what Google's implementation supports: you can set your own nickname, rather than having it derived from your email address—hopefully this won't bring on unexpected bugs.)
Hacked together by Chris Anderson with moral support from Bottlecap Labs. Download the modified Portable App Engine SDK or get the AppDrop.com source code (the Rails app you're looking at). The Amazon EC2 Image will be available publicly in the next few days.