What kind of "web app" are you looking to build?
I guess I'm not understand the initial question here, if the web app does not require a database why would you build it with one? Or is the question building a web app with a database that is not a sql database?
To me the needs dictate what to use and what language(s) do you know?
I would like to make these websites:
craigslist clone
wide open chat website
jobs website that excludes recruiters and shows w2 rate so it can be used
role playing game meetup kinda site FREE
FREe meetup kinda site
financial apps
insurance apps
ticketing app
cms app
CRM app
shipping warehouse app
education app
fitness app
I don't really feel like answering your other hypothetical this post was for you to show ME your web app if you made one without a SQL database like postgresql.
then to show your experiences...
Do you build anything on freebsd?I write web application for a enterprise corporation that you wont have access and I was simply trying to understand you're question to better point you in the right direction, but since you can't be bothered why should I.
Hmmm, happstack.com looks very interesting, I might take it for a short ride.