The big-name MMOs, such as World of Warcraft, EVE Online, Destiny 2, and Final Fantasy XIV, take up a lot of space on your hard drive. However, if you have a computer lacking hard drive storage, these mammoth installations can be a problem. If you want to play MMOs without downloading any files, check out these free MMOs that you can play in your web browser without taking up any space on your hard drive. 1.