Seeking Culture Clash Fic Recommendations

[VincentUrsus]

I have been reading Playing Catchup by EvilAuthor, as has been mentioned elsewhere in this forum.

I followed this by re-reading the Fenspace story Candle In The Dark, and Lost Kin by JustAGuy.

Does anyone have other recommendations for stories like these that show clashing societies, rather than just a single (or small group of) fish out of water?