I have already developed file type filtering functions through squid. Now I want to deal with content filtering aspects... What tools are available there for so in linux?

One very popular program is DansGuardian.

Nops I am not talking about URL filtering, indeed I want to point out issue like removing some content from pages like google

FOr example if any one searches google for angelina

than words like 'sexy' and so on should be removed.

It can be said 'CONTENT REMOVAL TOOL' in more specific way............

GUyz I want to stop FLASH/JAVA/ACTIVEX contents from loading from webpages........... I searched and got link that Squid can be used to do so........ but no more pie for me......

Neither am I. If you would have taken a few seconds to glance at the DansGuardian documentation, you would have seen that it filters based on Web page's actual content. That said, given the new requirements you've laid out, you should probably be looking at Privoxy anyway.

OK Sir but Is it compitible with squid?........ And it supports only few protocols HTTP and HTTPS........ But what about others like FTP and so on........ ?????

Yes, it is.

No, Privoxy only supports HTTP/S. You never mentioned you wanted to do content filtering for other protocols. You said you wanted to remove "some content from pages like google" and "stop FLASH/JAVA/ACTIVEX contents from loading from webpages", both of which Privoxy can do for you. If you want to do content filtering for other protocols, you'll likely need to start looking at a full-blown application-layer firewall. An example of these is Zorp GPL. That said, I encourage you to elaborate on what exactly it is that you are trying to achieve (the big picture), because without that information, it's difficult for members to provide you with quality suggestions and feedback.