HTML/OS is a Web development platform from Aestiva that has an interesting angle — the database is built into the binary kernel. So unlike ASP, JSP, etc. where you have a scripting language as middleware between a Web server and a database, in this case the same executable does both, which I imagine leads to a lot less code (you’d think, anyway, but I looked at some of the sample code and it didn’t look like less…).
It’s also cross-platform — you wrap your entire app up into a single executable, and drop it on a server. Interesting concept. It costs $1,499 and there doesn’t appear to be a trial version.
(Here’s something annoying — the above links may not work because it appears a session ID or something is embedded in the URL. I just tried to click one of those links about an hour after I last visited, and it backed me up to Aestiva’s home page. I copied the sample code link again, and I got a different URL this time. This would seem to prevent deep-linked into an HTML/OS site. However, in the spirit of full-disclosure, I will email them and ask what’s up.)