Al-Quads Birgades which is the armed wing of PIJ (second largest behind Hamas.)

Abu Ali Musata Birgades which is the armed wing of the PFLP (the Marxist-Leninists of Palestine)

National Resistance Birgades who are the Maoists

Jihad Jibril Birgades who are the ML Faction exiled in Syria

Al-Nasser Salah al-Deen Brigades a splinter from Fatah for their bootlicking

Al-Ansaar Birgades, another Fatah Splinter dating back to Hamas taking over Gaza.

Mujahideen are Islamists from Fatah (also split)

Al-Aqsa Myrters, separated from Fatah after Abbas decreed the disarmament of Fatah.

Abdul al-Qadir al-Husseini Brigades, Al-Aqsa splinter founded after Hamas removed Fatah from Gaza.

Rennets of Al-'Asifah reportedly

And lastly the Ayman Jawda Squads, though some information suggests they have not been active for some time.