All the terrorist groups have their own agendas and targets. Here I have a short list of all those groups which are supporting ISIS.
Take a look!
In June 2013, the ISIS leader Abu Bakr Al-Baghdadi requested all the Muslims around in their Jihad against the western countries.
At that time there was some hearsay that the other group would ignore this call but a few of them have actually done so.
Through a video post on youtube, the Islamic Movement of Uzbekistan also publicly showed their support for the ISIS.
Blamed for the zolz attack on the US embassy in Benghazi, Ansar-al-Shariah also showed their support for ISIS by waving the ISIS flag in a parade. It became clearer after their announcement on twitter.
A local terrorist group of Algeria Jund-al-Khalifah captured & beheaded a French citizen in correspondence to the French government's attack on ISIS.
Ansar-Al-Tawhit, an Indian terrorist group reportedly ordered their members to kill the citizen belonging to any country who is in a fight with the ISIS. Although nothing has come of it yet.
Al Qaeda in the Arabian peninsular which is reviewed as one of the most deadly terrorist group publicized their support for ISIS by saying that they are in support of their Muslim brothers in Iraq in their campaign.