and the classic method was the inspiration for Anki to begin with: making your own flashcards on index cards! You could do a version of spaced repetition by shuffling the deck.
Not sure the digital version is actually easier or more effective
Later used Repetitions (iOS / Mac / web) for the steps, EM boards, and informatics boards most recently.
Only within the last year finally tried Anki -- and this time for language.