The following games are tagged with space invaders

Arcadians
Acorn Electron
Acornsoft

Dragon 2
Dragon 32
J. Morrison Micros

Galactic Raiders
Spectrum 16K
Sinclair User

Galaxian
Spectrum 48K
Atarisoft

Invaders
Acorn Electron
IJK

Let's Invade
Commodore 64/128
The New Dimension

Motorola Invaders 2
Amiga 1200
Millennium

Retro Invaders
Spectrum 48K/128K
Climacus

Space Invaders
Dragon 32
J. Morrison Micros

Super Invaders
Spectrum 16K
Winters Ltd