Youtube Live is great for live coding.

Well I can't speak for general dev, but it's perfectly fine for Game Dev (code and art).

Twitch officially doesnt allow non-gaming related (game-dev is ok) streams. As long as you dont stream anything explicit you should be ok though

As of last week they expanded the definition of what they allow, explicitly mentioning coding

http://help.twitch.tv/customer/portal/articles/2176641-creat... Q. What if my creative broadcast is gaming-related art, game development, programming, or involves creation of music? A. You are free to choose whatever you think is the most appropriate category for your creative broadcast, so long as you adhere to the Rules of Conduct for the category when doing so.

Q. Does all Creative category content have to be gaming related? A. No, you’re free to broadcast your creative process for any genre!

You can set the game you're playing to "Programming", which they explicitly allow.

Their new Creative branch might cover more branches of coding.