Christian traditions are as follows: Eastern Orthodoxy, Arianism (modern-day Jehovah's Witnesses), Monophysitism, Nestorianism, Celtic Christianity (Protestantism), Roman Catholicism, Sedevacantism*, Old Catholicism (Jansenism), Mormonism (Latter-Day Saints). 

The only ancient Gnostic group that has survived to thee days is known as St John's Christians (aka Mandaeans or Sabaeans), and they practise the baptism of John the Baptist, and do not recognize Jesus as Messiah. Two other modern day Neo-Gnostic groups are Scientology and Manichaeism, an ancient heresy still very strong in mainstream Christendom.

* Although some Sedevacantist denominations are of recent formation (ex: the 'Palmerian Church' or the 'Universal Christian Church of the New Jerusalem') and most of them contest papal authority at various recent ages, this phenomenon factually began in 1378 with the Schism of the Western Church, hence before the Protestant Reformation. Sedevacantism differs from Protestantism on how we view the role of the Bishop of Rome and the teaching authority of Western church tradition. 

Origins of Protestantism

Early Reformation movements characterize the emergence of various points of discontent towards the established church, such as the suppression of genuine expressions of Christian faith by the Roman Church in the British Isles. And this led to what became then known as Magisterial and Radical Protestantism. It was later on followed by the American Great Awakening.