Would it be bad form to mention my own BASIC interpreter?
It's based on Sinclair BASIC, has been ported to Raspberry Pi, Linux/x86 and Pandora (natively runs in Windows) and has a load of programs bundled up:
Demos can be had here:
And on my youtube page:
It's been heavily influenced by BBC BASIC and AMOS, though retains as much backward-compatibility with Sinclair BASIC as possible