Chk is correct.
King's Gambit, Falkbeer Gambit, Evans Gambit, Max Lange Attack, Moeller Attack, Two Knights Defense, Goering Gambit, Danish Gambit, Scotch Gambit, Urusov Gambit, Boden-Kieseritzky Gambit, From Gambit, Staunton Gambit, Hennig-Schara Gambit, Anderssen Variation of the Scandinavian.
The are innumerable modern systems in the same vein, e.g. the Blackmar-Diemer, the Belgrade, the Smith-Morra, the Wing Gambit, the Moeller Defense to the Spanish, the Fajarowicz, the Geller Gambit, the Anti-Moscow Gambit, the various Marshall Gambits, 1.e4 Nf6 2.Nc3 d5 3.e5 Nfd7 4.e6 and so on almost ad infinitum. That's because it's actually a technique, not a style. And it's a technique that's justified, or almost so, in many given situations.
I exclude the Jaenisch, which is in a different spirit altogether. Latvian also.
I dunno how to classify the Cochrane and the Halloween. These are very close to the Allgaier, but the Allgaier was a very notable departure from the "my active pieces are going to mate you now" spirit of romantic chess. The Allgaier is perhaps the most revolutionary chess opening idea ever.
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