NxFilter is a freeware web-filter designed for monitoring and filtering Internet activity within an enterprise environment.

You will also be able to protect your users from malware and botnets while enjoying many useful features like; local DNS cache to accelerate Internet speed, load-balancing and fail-safe with clustering, Active Directory integration support, user or group based policy assignment, remote user filtering, bandwidth control, phishing protection, malware and botnet detection, and time quota.

Other NxFilter features include:

Application control
Safe-search enforcing
Dual policy for work-time and free-time
4 types of user authentication
*IP based authentication
*Password based authentication
*LDAP authentication
*Single sign-on with Active Directory
Blocking by domain category
Unlimited custom categories
Built-in GUI
Dashboard and reporting
Runs everywhere including Windows, Linux
Whitelist and Blacklist based on domain matching and keyword searching
DNS query log search with various conditions
Internationalized domain name support
Email alert
Syslog exportation