REALbasic is a cross-platform language and IDE very similar to
Microsoft Visual Basic.
REALbasic version 2007r3 is the last version to support compiling of
pre-OSX only binaries.

This is the latest and greatest if you want to develop PowerPC
"Classic" applications using REALbasic, as Carbon applications. For
"native", Toolbox-based Mac "Classic" applications, the latest version
is [REALbasic 2006r3][1].

Name: r k
Serial: H78JL4XV-GMTSBKDC-9KMHM5W3-32NGMFPU-RB600CPFUSA-MAC

Compatibility
Architecture: PPC (Carbonized) x86 (Intel:Mac)

Mac OS X 10.3.9 or later. This application is a Universal Binary, so
it works with Intel Macs as well.

  [1]: http://macintoshgarden.org/apps/realbasic-2006r3