WP Livestream - A WordPress plugin that automatically embeds live stream video on your website.
Vibby - Create + share highlights from any video in seconds
YouTube Time! - Is there a way to link to a specific part of a YouTube video? Yes.
EmbedPlus - YouTube WordPress Embed Plugin - customize a video, playlist, channel, or gallery
SkipTo - Skip to the best parts of a Youtube video
TubeChop - TubeChop allows you to easily chop a funny or interesting section from any YouTube video and share it.