- Three-point (Lawful, Neutral, Chaotic). Used in OD&D, B/X, BECMI, and RC.
- Five-point, type 1 (Good, Lawful, Chaotic, Evil, Neutral). Used only in Holmes, as far as I know.
- Nine-point (LG, LN, LE, NG, TN, NE, CG, CN, CE). Used in almost every edition after AD&D 1e, including AD&D 2e, 3e and 3.5e, and the current 5e.
- Five-point, type 2 (Lawful Good, Good, Unaligned, Evil, Chaotic Evil). Used only in 4e and "Essentials".
EDIT: Just realized that I did absolutely no research on Holmes for this, and therefore made a horribly inaccurate statement. I'm leaving it as it stands, though.