Here you will find some free stuffs to use with your Squid:
SARG Squid Analysis Report Generator
chpasswd allow your proxy user to change his/her password using the browser
ncsa_plus Squid authenticator with "password age"
admuser create, change, remove, disable and enable Squid and Web users in cgi
Blocking porn blocking the access to sites using words

and others to use with your system/web:
chetcpasswd allow your users to change his/her system password in /etc/passwd or /etc/shadow
mailmgr Sendmail log analyser
mailqmon Sendmail monitoring utility

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