These are mine:
Bardock's Spirit of Saiyans from Dragon Ball Z: Budokai 3.
There are much more, such as (honorable mentions): Super Saiyan Future Son Gohan's Kamehameha from Dragon Ball Z: Budokai Tenkaichi 3, Bardock's Final Revenger from Dragon Ball Z: Budokai Tenkaichi 3, Jeice's Crusher Volcano from Dragon Ball: Xenoverse and Vegetto's Spirit Sword from Dragon Ball: Xenoverse. My favorite Kamehameha in the anime comes from the Movie 4 of Dragon Ball, it's not a "favorite technique" overall but I do like Big Bang Kamehameha (whichever version) and the same for Vegeta's God Final Flash from Dragon Ball Heroes (however, it is my favorite version of the technique).
Hope I didn't forget any, that would be odd, to say the least.