Delphi Compiler

Turbo Delphi for .NET

This is part of new line from Borland for students, hobbyists and non-professionals interested in NET and Windows programming. The free explorer version comes with a comiler, IDE and built in components but is not extensible. There is also a professional version, which is not free but is extensible. Free registration is required.

Kylix for Linux

The Open Edition is free but I believe all programs created with it must be released as GPL.