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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