I made a compilation of useful links for my clan's sub a while back and thought some of you might find it useful aswel.
I plan on constantly updating this thread with new and useful links. Feel free to post links in the comments (along with a short description of what it is you're linking to) and I'll add them to this post!
Hinduman Guides and tutorials
biblestudyTV Guides and tutorials
Zapman Guides and tutorials
Drybear Guides and tutorials
FG3000 Guides and tutorials
Guides & Builds:
Tiermonster Guides on many Gods, some are outdated.
SmiteRepo Similar to Tiermonster (suggested by pennah)
Smitefire Same as Tiermonster but a little more based around casual.
Grappul Shows you common builds for Gods, made by the redditor /u/Kragalon.
Smitebuilder A God builder made by a fellow redditor. You can create your own builds and compare them to other builds.
SmiteStuff A page that has a lot of statistics on items and Gods aswel as a detailed player analysis which shows you your strenghts and weaknesses.
Cpteleon's Guides Pastebin link to Cpteleon's personal guides.
Smite Accademy Lots of useful guides including a Moba-dictionary.
CCs, Stuns, Mesmerizes A list of all the CCs, Stuns and Mesmerizes in the game.
The Word of Thoth Explains a lot of the damage calculation forumals. (suggested by Daenou)
Jungle Guide Compilation of jungle, laning and warding guides. Some of the information is outdated but most of it is still very useful. (compiled, partly created and suggested by LeoMcCoy)
MobaCounter Shows who certain Gods are strong/weak against. A little outdated but still viable.
LoL to Smite transition guide (season 2) A guide that tries to help people coming from LoL to Smite. Up to date for season 2.
Curse gems Click this link to claim the gems you got for using curse voice!
Aimbooster A webpage to train your aim on (suggested by Daenou)
OBS Software for twitchstreaming.
Krett Theorycrafting Thread General information on Smite and the math behind it. (suggested by pennah)
Smite.guru You can see your elo and other profile details
VGS Cheatsheet A simple cheatsheet for the VGS system. (suggested by MrMuggs)