Free url filter software for linux

Sax Filter is a modular set of filters that can be used to process XML documents via Javas SAX support.

Currently, the filters only process content (the ContentHandler interface).

webfilt is not a spam filter, but provides a generic web-based interface for Bayesian-style UNIX filters that need occasional training and corrections. It has been tested with SpamProbe and SpamBayes, but should work with other command-line filters too.

The webfilt system works with existing UNIX accounts, and consists of three distinct components that operate independently:

Users procmail recipes and cron jobs. The storelast.sh shell script is invoked by a users .procmailrc and simply saves a size-limited copy of each incoming e-mail message. The destination directory is determined by spam-state, done by procmail processing. A cron job periodically cleans old message copies.

webfiltd, daemon. The daemon component is invoked by inetd, and responds to a number of commands that allow a connecting client to authenticate, read files, and execute remote commands. This is all done with the authenticated users permissions. This daemon accepts just localhost connections.

webfilt.cgi, web interface The CGI program creates the web interface. Running with low privileges, it communicates with the webfiltd daemon over a socket to guarantee privilege isolation. The user logs in using their web browser and can then view recent emails and run commands on certain files (to train the filter).

squid-filter project was designed to build filtering capabilities comparable to those of Muffin into Squid. It consists of
a patch to Squid, containing a module loader and filtering hooks, and a set of filter modules.
Currently available filters:
- Redirection of URIs.
- Rejection of certain (configurable) MIME content types.
- Suppression of cookies.
- Removal of Javascript and ActiveX.
- Breaking of GIF animation loops.
- Detection of 1x1 images.
Main features:
- Modular, easily extensible by writing new filters.
- Flexible configuration. Filters are independent from each other.
- Each filter can take a list of URIs which should not be filtered (allow list). URIs are specified as full regular expressions.
- Client can choose to bypass filters case-by-case.
- Filtering keeps Content-Length where possible.
Purpose
A filtering proxy allows users to remove unwanted stuff from Web pages as they browse them. What "unwanted stuff" is obviously depends on the individual user, but things which are commonly regarded as annoyances include
banner ads, user behaviour tracking via cookies,
animated pictures, JavaScript, VBScript, ActiveX (dangerous as well as annoying).
Some of those things can be avoided by filtering URIs, which Squid can already do via an external redirect program. Others require a content filter.
Usually, a filtering proxy runs standalone and does nothing but filtering. Users have to configure this proxy in their browsers, and if they use a caching proxy too, chain them after the filter. In situations where the user runs Squid anyway (mostly because of caching for different browsers or a small LAN), it is convenient to build this capability into Squid.

Bloom::Filter is a sample Perl Bloom filter implementation.

A Bloom filter is a probabilistic algorithm for doing existence tests in less memory than a full list of keys would require. The tradeoff to using Bloom filters is a certain configurable risk of false positives. This module implements a simple Bloom filter with configurable capacity and false positive rate. Bloom filters were first described in a 1970 paper by Burton Bloom, see http://portal.acm.org/citation.cfm?id=362692&dl=ACM&coll=portal.

SYNOPSIS

use Bloom::Filter

my $bf = Bloom::Filter->new( capacity => 10, error_rate => .001 );

$bf->add( @keys );

while ( ) {
chomp;
print "Found $_n" if $bf->check( $_ );
}

FIR filter Plugin is an effect plugin for XMMS which enables to filter audio data using long FIR (finite impulse response) filters. Typical applications is loudspeaker or room equalization which typically requires filters with more than 300 taps (filter weights).

The FIR filter plugin uses the fftw3 library to perform the filtering using the overlap-and-add method. If fftw3 is not available the plugin will perform the filtering (convolution) in the time-domain which is much less efficient for long filters.

Shrew Proxy/Filter is a tiny proxy built on WEBricks HTTPProxyServer, extended for both URL and content filtering. Shrew Proxy/Filter is designed to be small, simple to configure, and easy to install.

It is extremely small, lightweight, and works quite well. All blacklists (both URL and content) are plain text, so most published lists can be simply dropped in and used.

w3t.org URL Shrinker is a small url generator via right-click. When you want to share a long URL (like on many news articles), just right-click on the page you want to link to and choose "Shorten this URL"; and youll get a super-short URL to use that forwards to the longer one.

The site now includes the ability to use custom URL "tags" like "ff" as in http://w3t.org/?c=ff The next version of the extension should include this new site feature.