This document profiles numerous armed opposition groups operating in Syria's Aleppo, Idlib, Homs, and Dera'a provinces. It provides details on each group such as their area of operations, commander, estimated strength, and in some cases a brief assessment of their activities and credibility. The largest and most effective rebel force mentioned is the Khalid bin Walid Brigade operating in Homs Province with over 3,000 fighters. Overall the document aims to catalog and provide basic information on armed opposition units active in Syria's ongoing conflict.