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Gun Monkeys

No, not every code game. It should explicitly state so. I think Frozen Synapse Prime is the exception, with a few others.

Interstellar Marines - Spearhead Edition - gives a normal edition gift
Contraption Maker - gives another gift copy
Crash Drive 2 - gives another gift copy

Tristoy, Frozen Synapse

Space Farmers

My code for ibb & obb gave me extra copy.

Gravity Ghost does.

Viscera Cleanup Detail has a 4-pack thing too. You get 4 copies.
http://store.steampowered.com/app/246900/

The Ship is actually a 5-copy as well.
Activating freshly-bought Steam gift or an activation code will activate the game and give 2 pieces of 2-packs (steam gift) , that can be gifted away. If someone activated the 2-pack, then he gets the the final, single-copy gift :)

Don't Starve Together :)