The widely used web proxy server Squid is used by Internet Service Providers (ISPs) and other people running web sites to make web access more efficient, for example by locally storing ("caching") web content that is frequently used.
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The open 3D race car game TORCS is great for people who like to drive. You can choose from different racing events, from a variety of race tracks and a large selection of cars. The graphics is detailed and fairly realistic. It includes skidmarks, smoke, and glowing brakes.

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Once upon a time there was a company called Sun Microsystems that sponsored project Darkstar. The plot was to create a revolutionary new system for designing and implementing massively multi-player online games (MMOGs). However, evil economic forces ravaged Sun for many years and it finally had to make a pact with Oracle to stay alive.
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While most software development, web page design, etc. nowadays is done using graphical user interfaces, experienced Unix/Linux people appreciate the simplicity and efficiency of the powerful text-based tools available on those platforms. If you are familiar for example with one of the powerful text editors, such as Emacs or VI, it is very easy to work remotely (over the Internet or intranet) on other computers using Telnet or SSH connections.
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