SquidRestrict is a Web based tool that allows multiple time restrictions to be placed on internet usage for firewalls that use the Squid Web Cache (http://www.squid-cache.org/).
SquidRH is a utility to convert squid log files to a database (like MySQL or PostgreSQL) and then generate statistic pages in real-time. This consumes much less the necessary than querying a squid log file, which sometimes gets very big.
...Increase respect of your corporate Internet usage policy, provide open and honest feedback such as WebMail use during work hours.
Plugs into an existing proxy or firewall such as Squid.