Northcastle Structured BASIC v1.7 by Mike Roche (June 1984) - This is very similar to Waterloo BASIC, in fact it will run most programs written for Waterloo. I found a nice article about this language in issue 23 of TPUG Magazine (May 1986).  Included on the disk is several versions that can be loaded into different parts of memory so it can co-exist with other utilities.  There is also instructions, source code (written in PAL assembler) and several sample programs.  I would consider this a complete package.