Web Filters, Content filters
Content-control software, also known as censorware or web filtering software, is a term for software designed and optimized for controlling what content is permitted to a reader, especially when it is used to restrict material delivered over the Web. Content-control software determines what content will be available on a particular machine or network; the motive is often to prevent persons from viewing content which the computer's owner(s) or other authorities may consider objectionable; when imposed without the consent of the user, content control can constitute censorship.
From : http://en.wikipedia.org/wiki/Content-control_software
Middleman proxy server
Supports the HTTP 1.1 and FTP protocols.
Intuitive Web interface for configuring and managing the proxy.
HTTP and FTP content caching; uses refresh algorithms similar to Squid.
Image and embedded object prefetching for faster page loading.
File rewriting with Perl compatible regular expression substitution.
Redirection using regular expression substitution on requested URL's.
Host, file, and MIME-type filtering.
Can process files with any external program.
Keep-alive connection pooling to avoid overhead of reconnecting to Web and FTP servers.
Can forward through HTTP and SOCKS4 proxies; supports NTLM and Basic authentication.
Can limit Internet usage to certain times; can limit bandwidth usage within arbitrary time periods.
Can block content using DNS blacklist services.
Can block inappropriate content using a unique keyword scoring system
Many URL commands to view information about a requested URL and temporarily change proxy settings; URL command to view changes made to a file with the file rewriting feature.
Supports gzip and deflate content encodings.
Can upload files to FTP servers.
Can delete or rename files, and make or remove directories on FTP servers.
Multi-threaded design allows proxy server to take advantage of SMP systems.
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