Java

According to their description, this is an "independent organization that supports the promise of Java as an open and universal (platform-independent, "Write Once, Run Anywhere") programming language."

Sun's site states, this is "the source for JAVA technology". There is a JAVA tutorial on this site that can viewed online or down loaded for offline viewing. It is very good and is one of the places to start, if not THE place, when learning JAVA.