Here we go… These are in alphabetical order for each topic, and as you will see the Blender list is the largest.
Texturing
Allegorithmic- Tutorials and better understanding for Substance applications
Vincent GAULT
Blender
Andrew Price- Great tutorials for Blender. Also has a podacast on the subject
Blender Cookie- Tutorials on many Blender topics
Blender Sensei- Another great tutorial set
BornCG- Blender tutorials
CG Geek- Wow. Great Blender tutorials
CGAstym- Just found this one, but he explains Blender process really well.
Maple Animation - Blender tutorials
Sardi Pax- Great Blender tutorials
XRG81- A must see for Blender tutorials. Not a lot of videos, but they are great.
PigArt- Lot’s of low-poly tutorials, but you have to pay attention, as they are fast.
UE4
Daerst- Not many videos, but what is there is worth it.
DokipenTechTutorials- More good information on different UE4 topics
L. Newton- Worth watching
Tesla Dev- Can’t leave this off the list!
Unreal Engine- These guys seem to know quite a bit about UE4
Just for fun
Glove and Boots- Who doesn’t love puppets, especially sarcastic and funny puppets
Geek & Sundry- Geek focused
The Muppets- Need I say more?
Screen Junkies- For the Honest Trailers series
LastWeekTonight- FF