Barracuda Web Filter- Filters Content, Malware, Social Media and Rogue App Threats, Dell SonicWALL-web content control and network security. This two cloud based software product for web contents filtering service can be evaluate by NEGD team if it is suitable for our government places.

added some software names

http://code.google.com/p/opendlp/

either

https://support.tenable.com/support-center/nessus_compliance_checks.pdf

DansGuardian falls into a much more Linux-like "I can change every setting and experience real, ultimate power!" category..

It is free tool and easy to implement.

Service provider name and vendor is "IMAGE VISION"
http://www.imagevision.com/

If you wish to filter such contents then we need gateways which will control everything, like in US few websites are not allowed for out of US PC he will track ur IP automatically, similarly we need gateways not only to protect hacking but also we will gain all control on social media without any knowledge for people.

for content filtering

microsoft security essentials by microsoft co-operation .details on microsoft official website

There are several search engines which allow rule based content filtering. Endeca is one such engine from Oracle which has an inbuilt rules engine which can be configured very easily.Its quite popularly used by several government agencies across the world for the same purpose.

Sir instead of integrating available software, it will be better if your software developer will come up with new product by themselves. You can also give this as project to be developed by best IT colleges.