It's quite unlike any other host here, and can't easily run your normal PHP applications (though it's by no means impossible). It supports Python and Java, there's no writable filesystem. It supports memcached, urlfetch (similar in functionality to cURL), mail (like php's mail function), xmpp (instant messenger communication), and basic image manipulation (it is very limited and only supports a few operations like resize, crop, rotate, flip). It has cron support and something called a blobstore which lets you store big files. There's a datastore, which can be accessed through a subset of SQL called GQL. It gives you a free .appspot.com subdomain and can be linked to a normal domain, however it doesn't support naked domains, so no
http://blah.com, it has to be
http://www.blah.comThere's free SSL support for .appspot.com domains, but it's not available if you have a custom domain.
For free, you get:
Up to 1.3 million requests a day
1gig of outgoing bandwidth a day
1gig of incoming bandwidth a day
6.5 hours of CPU time a day
1gb datastore size
10,000,000 datastore queries a day
700,000 calls to urlfetch a day
700,000 XMPP calls a day
900,000 image transformations a day
9,000,000 memcached calls a day
10 gigs of data cached a day
50gb of data sent a day
More resources can be bought at 12 cents per gigabyte of outgoing bandwidth, 10 sents per gigabyte of incoming bandwidth, 10 cents per CPU hour, 15 cents per gigabyte a month of stored data and 0.01 cents per person you spam.
It's a pretty good host, but not quite as easy to use as I would like. It's google, so pages are served up quite insanely fast and there's very little chance of the host dying any time soon.