This Wiki is running on old Dell GX1 with Redhat 9 Linux and Apache 2, automatically managed by the LCFG configuration system from Informatics.
I chose this Wiki from the selection reviewed on WikiPedia because it was reviewed as simple, modular, and written in Perl. It seems to work fine, and I didn't do any sort of comparison.
I installed from the instructions, with only a couple of noteworthy comments:
I also implemented the University EASE authentication service. The instructions for doing this aren't perfect, but they provide an adequate guide. Of particular note ..