Those are not specific to WebRTC though. They are needed protocols if you want a chance to traverse NATs. They're used by WebRTC and other VOIP stacks too.
Yep, same here. Especially when one takes a step back, loads a h323 softphone that, unlike browsers on linux, uses hw encode/decode, and suddenly my laptop doesn't want to fry itself.
What are TURN and STUN?
Ways for punching through NAT. STUN lets you discover NAT addresses and the like to try and establish a connection with a port on the WAN IP, or some other connection mechanism. TURN is effectively a proxy that can be used by both sides to establish a connection through NAT.