Gems in the Quanta library

[RWAP]

I thought it would be nice to highlight any gems that people come across in the Quanta library (that are not available elsewhere)...

For me...
1) Languages - There are a couple of Forth interpreters and a Prolog interpreter - not sure if these are on the Sinclair QL Homepage...
2) QDOS Information - There a quite a few little code extracts from Tony Tebby, plus information about not only QDOS Traps, but TRAPs and system calls on the THOR and used by Ultrasoft
3) Couple of excellent programs - DBAS for databases and DMON (machine code monitor)