Oscean is a flat-file wiki engine by Devine Lu Linvega

https://wiki.xxiivv.com/site/oscean.html

It could be entirely possible it's not meant to be more than a personal
wiki engine, but I'm particularly interested in its related file formats
Indental and Tablatal.

Indental (.ndtl) https://wiki.xxiivv.com/site/indental.html
Tablatal (.tbtl) https://wiki.xxiivv.com/site/tablatal.html