Many great recommendations.

Some other that I don't think were mentioned so far:

• The Baron Against the Demons / El barón contra los Demonios (2006) - Completely insane Spanish action/scifi

• Hellevator (2004) - Crazy Japanese scifi with action/horror elements

• Zone 39 (1996) - Cool low budget Australian cyberpunk-adjacent movie

• Nirvana (1997) - Excellent Italian cyberpunk thriller

• Shocking Dark (1989) - 80s Italian ripoff of two famous scifi/action movies from the time

• Webmaster / Skyygen (1998) - Solid Danish 90s style cyberpunk thriller

• Neon City (1991) - Solid post-apocalyptic flick

• Cold Harvest (1999) - Kungfu flick with a post-apocalyptic setting

• Def-Con 4 (1985) - Post-apocalyptic action/adventure

• Slipstream (1998) - Post-apocalyptic film with beautiful mountain cinematography, with Mark Hamil as the bad guy

• Cyborg (1989) - Jean-Claude Van Damme kicks ass in a post-apocalyptic future

• Radioactive Dreams (1984) - A strange mix of post-apocalyptic movie and 40s era pulp detective

• Nightflyers (1987) - 80s space horror based on a novel by George R R martin

• Terminal Invasion (2002) - Low budget The Thing ripoff with Bruce Campbell

• Shadowzone (1990) - Horror set on an isolated base

• Population 436 (2006) - A Stephan king style horror with Fred Durst

• The Langoliers (1995) - A unique, almost scif-fi, horror/thriller based on a Stephen King novella

• Black Mountain Side (2014) - Isolated norther research station horror

• Butterfly Kisses (2018) - A somewhat novel take on the found footage genre, has flaws though

• The Last Winter (2006) - Norther isolated research station horror

• The Presence / Danger Island (1992) - Solid thriller/horror tv movie.

• Cyber Bandits / A Sailor's Tattoo (1995) - Wholesome adventure/cyberpunk movies from the 90s with Martin Kemp

• Mars (1997) - Olivier Gruner visits a Martian colony to kick ass

• Alien Cargo (1999) - A somewhat well done TV movie Alien ripoff, but more a thriller than a horror

• Lord of the Deep (1989) - The Abyss ripoff (even more low budget than DeepStar Six and The Leviathan)

• Future Fear (1997) - Solid softcore action/scifi

• Hybrid (1997) - Solid softcore horror/action vaguely based on Alien

• Forbidden World (1982) - Softcore vaguely based on Alien