PHP-WebStatus Monitor is a script that monitors a website's connectivity. It uses php for all the scripting. It has a MySQL backend with a detailed statistics viewer.
Traffic monitoring daemon. Uses libpcap to collect accounting info. Works on linux, freebsd, openbsd, solaris. Accounting information is stored in mySQL. Support per hour statistics. Web interface included
Apache VirtualHost Transfer Counter is a set of files which allow you to quick and easy monitor utilization of http bandwitch on your server. It can give you also few statistics about VirtualHosts.