Battlefield games
That sad, despicable feeling when EA prevented any form of modding BF3/BF4, or rather just straight-up lack of locally hosted private servers.
One game that not all that many people know of is Phun, which I would heavily recommend, otherwise now known as Algodoo. Though the new instance of it (Algodoo) is sort of meh, as they introduced bunch of handicapped pay features which were not present on Phun.
You can also find lots of awesome stuff in the public libraries for the game anyway.
