NxFilter

NxFilter: Lightweight, reliable web filter for enterprises

NxFilter is a light and fast solution if you’re looking for a trustworthy web filter for the enterprise environment. Plus, it won’t cost you a dime since it's 100% free.

Altough it won’t cost you anything, NxFilter has a really simple GUI so you’ll be able to configure the program in no time, without being forced to use the command line prompt.

NxFilter was built for performance using local web proxy filtering and a speedy DNS filter. You can define exactly which websites need to be blocked using policy rights and authentication. It allows you to completely control Internet and network traffic, providing thorough daily and weekly reports.

NxFilter also includes many other useful features such as safe-search enforcing, HTTPS filtering, Active Directory integration, Application control....etc.

Requirements:

- Java 1.6 or higher
- 512 MB RAM
- 4 GB free disk space
- 53 port on UDP, 80 and 9443 port on TCP