Cities Skylines
http://www.reddit.com/r/citiesskylines
http://www.citiesskylines.com/
https://www.paradoxplaza.com/
https://skylines.paradoxwikis.com/Cities:_Skylines_Wiki
http://forum.paradoxplaza.com/forum/forumdisplay.php?859-Cities-Skylines
http://www.skylinescity.com/cities-skylines-faq
http://www.reddit.com/r/CitiesSkylines/comments/2wvyfn/height_map_requests/
http://www.citiesskylines-nation.com/
http://steamcommunity.com/workshop/
http://terrain.party/
Youtube:
Skye Storme – www.youtube.com/user/SkyestormeGaming
quill18 – www.youtube.com/user/quill18
Sips – www.youtube.com/user/YogscastSips
Arumba – www.youtube.com/user/arumba07
thesixthaxis – www.youtube.com/user/thesixthaxis
DieselDesigns – www.youtube.com/playlist?list=PLrkj-hwHboELwlNnWTBqmPhHtpt7CVzI2
HypnotoadProduction – www.youtube.com/playlist?list=PLKsqXBrW3Vr1ygUjMNjEdYvoJdzPD6PmS
Arumba – www.youtube.com/playlist?list=PLH-huzMEgGWD0Ag1pb_BaH568BaKkjm7w