I don't think this falls under Fringe/Weird, but definitely under OSR/Indie:
I highly recommend checking out Diogo Nogueira's work. I picked up a new game of his this weekend, and I'm a fan of the OSR approach, yet with minimalist systems.
Solar Swords and Cosmic Spells is a cool system that scratches that 70's acid sci-fi itch. Make your own Flash Gordon vs the Zombie Wolves of Venus kind of stuff.
Diogo also makes Sharp Swords and Sinister Spells (More classic fantasy) as well as Dark Streets and Darker Secrets (Noir, crime, etc)