The Common Application - Over 500 colleges and universities worldwide (majority in the U.S.) accept The Common Application. The application is completed online and submitted electronically to the colleges and universities to which you apply.
UCAS - Universities & Colleges Admissions Service is the on-line service for processing applications for most colleges and universities in the United Kingdom. In addition this site can help with the selection process, searching for college majors and answering many of the questions you might have about studying in the UK.
Ontario Universities' Application Centre - The OUAC, located in Guelph, Ontario, Canada, is a central bureau whose key function is the processing of applications for admission to the province’s universities.
University of California - One application can be completed on-line and submitted to as many of the 10 UC schools to which you will apply.