Good Gambits For White AND Black

The Scandinavian Gambit is good enough that accepting it is dubious, but it isn't really a gambit if taking the pawn is a bad move.
The two-pawn Goring Gambit is interesting. I'm not sure if it's completely sound, but it looks OK, as basically an improved version of the Danish where 6... d5 isn't possible with the knight on c6.
The Evans isn't doing great for White, as Black has plenty of instantly equalizing "common sense" defences, and a couple of ways to try for more. It's still playable, though.
The Vienna Gambit with 2... Nf6 3. f4 is fun, and not bad from a theoretical standpoint.

Yes @ChessOath. I stick to mainlines myself, but not all gambits are bad. In fact, most stuff "between the hedges" is mostly sound. Maybe not good, but for the most part, decent.

King's gambit, smith morra, scotch gambit, I suppose, are somewhat sound. Other than that, I'm not quite sure at all, to be honest.

I had to look the Icelandic Gambit up to remind myself of just what it was. Question: since I've never looked at or played 3.c4 before in the Scandinavian (that's just not the way that I think as a player, why would I even look at holding onto the pawn when I can play d4 and be very clearly better with nothing to calculate?), I have to ask if there is any way for Black to get the pawn back? It appears that the only moves ever played are c6 and e6, which both allow White to play a pawn up. If that's the case then why isn't the move 2...Nf6 considered the gambit?
Anyway, I've noticed that not a single Black gambit not a part of the Scandinavian Defence has been mentioned. I can think of one obvious answer that hasn't been said. Considering it gets talked about so much here on chess.com it's rather crazy that nobody has mentioned it. The Two Knights Defence (Italian). The Benko also of course. I don't claim to know sound that is though.
Hey guys other than the scotch, king's and queen's gambits, what other gambits are good for white? You can also put gambits for black besides Icelandic Gambit.