TwillManager is a side project created at our company (Code Sprinters), written in Python (with CherryPy, Mako, sqlite - and, of course, Twill - scripted headless web browser).

Its main purpose is to monitor web applications - every few seconds (interval can be defined) it runs the script, which can load up a page, verify links, submit forms etc. - and if the script fails, sends out an e-mail notification. The status of all the defined watches is also available through a simple web interface. The application is in very early stage, though usable nonetheless. The code can be downloaded from Github: http://github.com/codesprinters/twillmanager/tree/master.

Credit due to Adam Byrtek for the idea of the application and Krzysztof Walo, together with whom I've implemented this app.