Today (2003) Phase One Systems publishes software development tools for THEOS(R) systems.
Also, Phase One Systems licenses a porting tool called CET Basic. CET Basic is compatible with THEOS BASIC, MultiUser BASIC, OASIS BASIC, and UX-BASIC. This means you can keep most of your existing source code, and using W/32 BASIC, recompile your THEOS, OASIS, or UX-BASIC programs to work under additional operating systems such as Windows95/98/NT/2000, Linux or SCO UNIX.
THEOS is a registered trademark of THEOS Software Corporation.
Phase One Systems can be reached at http://www.PhaseOneSystems.com.