Some of the research work at Stellenbosch was also related to Oberon, e.g. the Gneiss microkernel by Johan de Villiers [1,2], to which Jacques Elf and Frank von Riet ported Native Oberon [3]. Quite interesting and not well-known work IMHO.
[3] Jacques Elf and Frank van Riet, Porting Native Oberon to the Gneiss Microkernel - A Guideline for Future Ports, 2002.
http://norayr.am/papers/port.ps
[1] Johan A. De Villiers, J. Adriaan, Micro-Kernel Support for a Lightweight Extensible Workstation Operating System, University of Stellenbosch, 1999. http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.40.1...
[2] Johan A. De Villiers, Validation of a Microkernel: a Case Study, University of Stellenbosch PhD thesis, 1999. https://core.ac.uk/download/pdf/37373005.pdf
[3] Jacques Elf and Frank van Riet, Porting Native Oberon to the Gneiss Microkernel - A Guideline for Future Ports, 2002. http://norayr.am/papers/port.ps