Fast start API v3 (add your Youtube API key to variable gkey3 in key.php) code

Online demo
Native embed: YTAPI Youtube
JWPlayer: YTAPI Youtube
VideoJS: YTAPI Youtube

Download modified for work with YTAPI - JWPlayer&VideoJS players
Glype proxy plugin for Youtube and Vimeo
Option "vq" in embed URL: 240p-small, 360p-medium, 480p-large, 720p-hd720

ClipBucket plugin
WordPress plugin
CMS for YTAPI: third party
Patch for CMS: PHPVibe Prismotube PHPMelody
Official players pages: JWPlayer JWPlayer Ads example VideoJS VideoJS plugins
Native player: parameters configurator