The iberian peninsula was all about the ZX because pirating tapes was the norm. Also, saving custom software in tapes was cheap and producing the games in tapes, the same; they could even fight piracy by selling the games in newspaper kiosks at a very cheap price.
Similar on how the Play Station spread about the country: burning CD's and modding the PSX was trivial.
Yeah, one reason why I grew up bilingual, besides having grandparents close to Badajoz, was the amount of Speccy stuff in games and magazines that we got from the other side of the border, because why bother with translations. :)
Microhobby, Micromania, Solo Programadores (this one came later in 32 bits days), are some I still remember the names.
La Abadía del Crimen, Sir Fred, Livingstone Supongo, Game Over, and such.
And Aventuras AD; but TBH most modern games written for the ZX in Spanish (especially text adventures) are many times better than "La edad de oro del software español" (The golden age of the Spanish software).
I have some text adventure saga (Los extraordinarios casos del Dr. Van Halen) which is about
Lovecraftian/Poe themes and such; it's composed of nine tapes.
If you are interested, I can send a zip to you with a PDF and the TAP files.
Also, on modernish platforms, there's "El archipiélago", probably the best Spanish Z Machine game ever. You can get the last one at IFDB. Getting the first saga it's a bit cumbersome because you need to get nine downloads and sort the 'volumes' after that.
Back to "Van Halen", as the games are designed with PAWS/GACG or whatever was called that universal format from the 80's, the Zesarux emulator can trap all the interpretatation (as if it were a ZMachine-like interpreter itself) and giving you options to both debug the adventures and translate them to Portuguese (from any to any language) on the spot with online services (and maybe local, IDK; it shoudn't be difficult to add support to Argos Translate, Apertium and the like). Input is not translated but, well, these games have a really common verb set.
Similar on how the Play Station spread about the country: burning CD's and modding the PSX was trivial.