What is a good reference to explain the different protestant sects and denominations? I would like to gain clarity on the definitions of evangelical, Presbyterian,  Baptist, Methodist, Pentecostal, Calvinist, Jesuit, Lutheran, Quaker, puritan, and others.  It should explain the main differences and how they evolved.  Free but accurate online resources only please.
For ease of access and breadth of scope, it would be hard to go past Wikipedia. Perhaps you should start with either their article on Protestantism or the one on Christian denominations and then start chasing links from there.