Babbage Difference Engine: Emulator in UBASIC.
DOS Beowulf: Simple, inexpensive Beowulf supercomputing clusters for DOS using UBASIC.
MALM: A collection of UBASIC programs which can be used in number theoretic investigations.
UBASIC: Version 8.8f download from the official site.
UBASIC: Rather-old version (8.74) of this package.
UBASIC Home: Downloads for version 8.8f, help files, bug reports, benchmarks, timings, and links. (Much in Japanese).
UBASIC Programs: Simple examples for use in a Number Theory course.