My understanding is that it's the Taliban, and a cursory check of credible references supports this. That's a group formally alligned with AQ, but distinct from it, again, via credible references.

Other active entities include the Islamic State (ISIL / Daesh), and various organisations largely funded / supported and/or organised around Iranian, Syrian, and Palastinian interests.

Please note that this is not an area of personal expertise.

> That's a group formally alligned with AQ, but distinct from it, again, via credible references.

Actual "formally", or "formerly" (or both)?