These are very old ZX Spectrum's programs written by me. You can run these oldies in most Spectrum emulators. All this crap probably means nothing to anyone but my friends and me.
z80 format
Glub 
,
3D,
Katoth,
La Huida de Ciro,
Diox,
Scrollisis [aka Rubbish Rain].
tap format
The Rhun series
Rhun 
,
Demon,
Nauta, and
Atenas.
Other rarities
Glub [with loader] ,
Dux,
Kraj,
Misión Subterránea,
Orion-7,
Peregrino,
Cavernon,
Ultimatum,
Galope,
Glub 2 [incomplete].