Hello,

You may find some of these links useful.

Slovak company Didaktik Skalice produced clones of ZX Spectra called Didaktik.

https://cs.wikipedia.org/wiki/Didaktik
https://en.wikipedia.org/wiki/Didaktik

The largest software publishers include Proxima Software (Czech) and Ultrasoft (Slovak).

https://spectrumcomputing.co.uk/list?label_id=11693
https://spectrumcomputing.co.uk/list?label_id=14925

Reviews of these games can be found on this site.

Website with CS titles for ZX Spectrum:
https://cs.speccy.cz/