Gambits List

There are no 0 or 1 ply gambits.

2-ply gambits:
Englund Gambit 1.d4 e5
Old Benoni: 1.d4 c5
Jaenisch Gambit: 1.c4 b5
From Gambit: 1.f4 e5
Ross Gambit: 1.Nf3 e5
Duras Gambit: 1.e4 f5

3-ply Gambits:
King's Gambit: 1.e4 e5 2.f4
Queen's Gambit: 1.d4 d5 2.c4
Blackmar-Diemer Gambit: 1.d4 d5 2.e4
Réti Gambit: 1.Nf3 d5 2.c4
Réti: Wing Gambit: 1.Nf3 c5 2.b4
English: Wing Gambit: 1.c4 c5 2.b4
Sicilian:Wing Gambit: 1.e4 c5 2.b4
Gibbins-Weidenhagen Gambit: 1.d4 Nf6 2.g4
Zilbermints-Benoni Gambit: 1.d4 c5 2.b4
Omega Gambit: 1.d4 Nf6 2.e4
Staunton Gambit: 1.d4 f5 2.e4
Krejcik Gambit: 1.d4 f5 2.g4
Alekhine: Krejcik: 1.e4 Nf6 2.Bc4
John Tracy Gambit: 1.e4 Nf6 2.Nf3
Wagner-Zwitersch Gambit: 1.f4 f5 2.e4
Wade Gambit: 1.c4 f5 2.g4
Hickmann Gambit: 1.c4 f5 2.e4
Wheeler Gambit: 1.e4 Nc6 2.b4
Grob Gambit: 1.g4 d5 2.Bg2

More-ply gambits will be added later.
If I missed something, please post and I'll add.

You forgot the feared anti-Grob weapon 1. g4 f5!

Also 1. g4 g5 2. f4! Grob Openings: Coca-Cola Gambit. It's a real think try it.

Really, there are a lot of weird gambits if the players feel like doing strange moves. For instance: 1. a4 b5 (I've just invented it).
But, if a pair of Grand Masters have a silly day you can see things like 1. b4 c5 : Sokolsky Opening (also known as the Orangutan or Polish); Birmingham Gambit.

@savagechess2k Add the Smith-Morra Gambit

Also d4 nf6 c4 e5 Budapest gambit and albin countergambit

Herrstrom Gambit 1.Nf3 g5
1.e4 e5 2.d4 this is the start for some gambits (danish gambit, goring, urusov)

Remember that a gambit is a "chess opening in which a player ... sacrifices material, usually a pawn, with the hope of achieving a resulting advantageous position." (en.wikipedia.org/wiki/Gambit)

So, @PepeMaster , a4 b5 is not a gambit, because Black gets no advantage from b5 (it opens a file for the white rook).

A list of gambits can be found at en.wikipedia.org/wiki/List_of_chess_gambits

@YatrikPatel I'm agreed with you. It's a good definition. However the point is the word "hope" and there are people with unsound hopes.
The most of the gambits are unsound if the rival play well but you play against a human and some times the purpose could be taking him out of book though the position is objectively worse.
(Anyway, the example I've made, it was only a joke ;-)

Tennison Gambit in the Scandinavian:

1.e4, d5, 2.Nf3