Looking into Slite now to check. With OpenKnowledge, the content is just markdown files on-disk, so there shouldn't be anything exclusionary about it. Not sure how/if Slite handles markdown files. Will take a look.

tl;dr: Slite supports import/export Markdown files, so not a native "interop".

Links: https://slite.slite.page/p/5XOO7_tII0D87T/Importing-Files, https://slite.slite.page/p/PxKfPvLrLHj07O/Exporting-Your-Doc...

Recommend trying it for some personal notes/specs/etc. -- can be used independently.