CommandBASIC: Module that allows BASIC statements to be executed from the command line, or even an obey file.
DoggySoft Software: A range of public domain programming utilities, including WimpSWIVe, a programmer's support module that provides a full dynamic pre-trapping and post-trapping vector chain for Wimp SWIs.
Enla: Freeware program for finding dead code in C programs.
Leo Smiers: Includes Information, a utility to display VDU, mode and system variables.
ModInfo: Application that returns information on modules that are dragged to it. If possible, creates two menus - one for SWI calls the module creates - one for any *commands it adds.