SimilarMinds.com Compatibility Test
Rates friendship and relationship compatibility between two people.
http://similarminds.com/match/

QuirksMode - CSS contents and browser compatibility
Tests of CSS2 selectors, pseudoclasses and declarations, including compatibility information for Explorer, Mozilla, Safari, and Opera.
http://www.quirksmode.org/index.html?/css/contents.html

CompatibleChoice Compatibility Test
Ph.D. developed compatibility test for couples in seven critical areas that predict long term relationship satisfaction.
http://www.compatiblechoice.com

The Unofficial PCTel modem in Linux compatibility Database
List of all types of PCTel winmodems and their compatibility status. Users can submite their modem information in this site.
http://pctelcompdb.sourceforge.net/

Backward Compatibility Viewer
Web page viewer for checking backward compatibility according to HTML version standards or specific features.
http://www.delorie.com/web/wpbcv.html

Environmental Accord
Sustainability and environmental risk management consultants providing environmental impact assessment, corporate social responsibility (CSR) reporting, environmental audit, environmental baseline studies, environmental information systems, and analytical services.
http://www.envaccord.com/

White-Box Enterprise Linux
RPM based Linux distribution that retains enough compatibility with Red Hat Enterprise Linux (RHEL3) to allow easy upgrades and to retain compatibility with their Errata SRPMS.
http://www.whiteboxlinux.org/

HyperStudio
A multimedia authoring tool by Knowledge Adventure that provides unique features such as accessing data on the Internet, the ability to create and edit QuickTime and AVI movies, built-in image capture with AV Macs or digital cameras, Mac-Windows-Web project compatibility and the widest range of file type compatibility for graphics and sound.
http://www.hyperstudio.com/

Environmental Information Resources
Topical sections include US environmental resources (listed both by subject and by name), international environmental resources by country, environmental education programs and campus ecology initiatives, environmental career opportunities, environmental usenet news groups, and environmental listservs. From George Washington Univ.
http://www.gwu.edu/~greenu/index2.html

Jung Marriage Test
Jung Marriage Test determines partners' compatibility in the relationship and recommends optimal behavior for your particular couple
http://www.humanmetrics.com/infomate/infomatepass.asp