1) Al-Wahabiya :
Founded by Mohammed Abdul-Wahab and supported by Saudi Arabia Royal family. Here are some sites about their fact...:
The True Picture of Wahabi Movement.
The Truth About Wahabi movement (Al-Haqeeqah).
2) Nation Of Islam :
Founded by Elijah Mohammed in the USA. Now led by Louis Farrakhan. Visit their website...
Nation Of Islam.
3) Attasia Way:
An Islamic sect in Yemen, I am afraid I don't know much about. But you can visit their site to know more about them...
4) Al-Ahmadiyah / Al-Qadayaniah:
An Islamic Sect Know all About them and how to answer them.
5) Baha'i Sect:
An Islamic sect know all about them.
An Islamic Sect in mainly in Syria And Lebanon.