From Epic:
https://docs.unrealengine.com/latest/INT/Resources/SampleGames/
https://wiki.unrealengine.com/Survival_sample_game
https://docs.unrealengine.com/latest/INT/Resources/
https://wiki.unrealengine.com/Category:Example_Projects
GitHub:
https://github.com/tomlooman/EpicSurvivalGameSeries
https://github.com/shadowmint/ue4-sample-project
More:
http://www.hourences.com/thesolusproject/
http://kotaku.com/amazing-student-project-took-just-7-weeks-to-make-1648791507
Download 13 Beautiful Unreal Engine 4 Examples for the Oculus Rift DK2