Is al-Qaeda connected to other terrorist organizations?
Yes. Among them:

Egyptian Islamic Jihad
Jamaat Islamiyya (Egypt)
The Libyan Islamic Fighting Group
Islamic Army of Aden (Yemen)
Lashkar-e-Taiba and Jaish-e-Muhammad (Kashmir)
Islamic Movement of Uzbekistan
Salafist Group for Call and Combat and the Armed Islamic Group (Algeria)
Abu Sayyaf Group (Malaysia, Philippines)
These groups share al-Qaeda’s Sunni Muslim fundamentalist views. Some
terror experts theorize that Al-Qaeda, after the loss of it Afghanistan base,
may be increasingly reliant on sympathetic affiliates to carry out it agenda. Intelligence officials and terrorism experts also say that al-Qaeda has stepped
up its cooperation on logistics and training with Hezbollah, a radical,
Iran-backed Lebanese militia drawn from the minority Shiite strain of
Islam.