Browsershots makes screenshots of your web design in different browsers. It is a free open-source online service created by Johann C. Rocholl
Watir is a simple open-source library for automating web browsers. It allows you to write tests that are easy to read and easy to maintain. It is optimized for simplicity and flexibility.
http://slashdot.org/article.pl?sid=04/03/30/2333258
"When Orkut, LinkedIn, Friendster, Zaibatsu and Tribe.net just don't cut it, meet PeopleAggregator, an open-source, PHP-written, FOAF-based social network. There's the site and there's the source in case you decide to launch your own. I found out about PeopleAggregator reading this interview with Mark Canter on Read/Write Web today."
phpAdsNew is an open-source ad server, with an integrated banner management interface and tracking system for gathering statistics. With phpAdsNew you can easily rotate paid banners and your own in-house advertisements. You can even integrate banners from third party advertising companies.