[Android] Fractal Space HD Game (and more) Free @ Google Play

Fractal Space HD: "An immersive 3D first person adventure and puzzle game in a beautiful science-fiction universe! Will you solve the mysteries of this space station and get out alive?". Fee (normally $3.69)

Some other popular freebies and deals with high ratings:
Equalizer FX Pro (and many other audio contol apps from WetcRun): Free (normally $2.89)
Xproguard Anti-Theft: Free (normally $5.49)
Xproguard AppLock: Free (normally $5.99)
Inked game: $3.49 (normally $7.49)
Doom and Destiny Worlds: $1.79 (normally 7.49)