A lot of people are working on technical solutions to screen out the undesirable Internet materials. They create software that limits access to computers, the Internet or specific parts of the electronic world. The Firewalls site provides a comprehensive view on Internet security. Much attention has focused on Surfwatch which screens newsgroups, Web sites, and FTP locations. Other software- screening alternatives include CyberPatrol, NetNanny and others. Time's Up lets parents set time limits for use of on-line services. The following lists some screening software, some filtration projects and research groups involved in filtering systems.

Surfwatch
SurfWatch is a new type of software which helps parents, educators and employers reduce the risk of children and others uncovering sexually explicit material on the Internet. SurfWatch and Compuserve team up to produce this software.

Cybersitter
The Cybersitter is a Window program that will give the user the capability to block access to the common types of graphics files as well as specified files and programs.

Netnanny
The NetNanny provide an invisible monitor between the Internet and the family. It operates quietly in the background, carefully screening out user defined "words", "phrases" and other contents that the user considers as inappropriate.

Safesurf
The Safesurf is an organization who aim is to create a giant safe cyber-playground. It is implementing an Internet rating standard that is bringing together parents, providers, publishers and developers and others making the child safe sites with the SafeSurf Wave.

Cyber Patrol
The Cyber Patrol is a software of Microsystems Software Inc. It provides time managenemt, full Internet access management with parental preference control and application blocking. The Home Edition provides basic Internet filtering of pornographic materials, violence, partial nudity art, sexual acts, texts and gross depictions.

NewsClip
The NewsClip is a rule-based filtering system. The user can specify inclusion and exclusion criteria for information streams such as UseNet and the commercial newsfeeds sold by the owner's of NewsClip, ClariNet. The ClariNet newsfeeds include world news, sports, and business news, through the API and Reuters news feeds as well as access to computer and Internet related articles. The commercial newsfeed is available though site licensees and individual subscriptions, although the rates are expensive.

MIT Filtering Agents
The MIT Media Center's agents filter news and make recommendations about the relevance of interesting messages. They use a machine learning technique to construct interest profiles for a user. When an agent is in doubt about a recommendation on a certain message, it consults other users' agents to see what they would recommend. The agent gets feedback on its recommendations based on user ratings of the messages. The agents use a sophisticated genetic algorithm to evolve a dynamic interest profile.