AolServer, the Web-server program used by (surprise!) AmericaOnline. AolServer was originally NaviServer, published by NaviSoft and licensed for $5K per machine; AOL liked the server so much that they literally bought the company. After the purchase, AOL didn't want to be in the software-sales business, and they didn't want to annoy NaviSoft's other customers, so they just gave away the binary. Then PhilipGreenspun convinced one of AOL's executives that making the program open-source would be in the company's best interest.

AolServer is a multi-threaded server, allowing for dynamically-loaded libraries to extend the server.  It has Tcl interpreters embedded, and includes AolServer Dynamic Pages, a technology like ActiveServerPages, for quick development of quick-responding dynamic websites.

AolServer is used in production by AmericaOnline, among others.

http://photo.net/wtr/aolserver/introduction-1.html 

http://aolserver.com/

AOLserver Wiki: http://panoptic.com/wiki/aolserver/

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