Three most important protestant reformations were 1. Lutheran 2. Reformed (Calvinist, Presbyterian etc.) 3. Anglican traditions
The beginning of the reformations are considered to originate from Martin Luther. He started out as a lawyer, but ended up being a monk, after surviving a storm. After he had studied the bible, he realized, that many things in the current Church are not in harmony with the bible and it's teachings. He published a list of 95 Theses, concerning the twisted act of the Church selling indulgences. He also thought that everyone should be able to understand the context of the bible, so he translated it to Germany, so anyone could read it, not only the priests.
Calvinism (also called the reformed tradition, reformed protestantism, reformed Christianity, or the reformed faith) is a reformation, gotten it's name from their theology of John Calvin. Name can be misleading, as there's no single founder for this reformation, but a wide range of influences affecting on it.
English reformation happened, because Henry VII, former king of England, wanted to annul his marriage with Catherine of Aragon. He had to break up with Rome and he signed himself as the head of the English Church. This led to periods of powerful reformations led by staunch conservatives.