IBM and Compatibles: DOS: JRBBS
Author: Jim Ryan
Author Contacted?: Met Jim Ryan's son at Rubi-Con and he put me in touch with his dad!
Additional Notes:
Jim Ryan writes "JR-BSS was written in turbo pascal (about 17,000 lines of source code) and ran on PC/MS-DOS. I was used by about 30 different sites... Most were open to the public, but a few were used by private companies... Had many "under the covers" features that made it unique, had all kinds of security (levels, access groups, who is, encryption templates, dial back, etc), you could customize all the menus, add your own commands, it also had end of day automated processing...."