SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Tubics - SEO & analysis for YouTube videos
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
VidIQ - Generate tags for YouTueb Videos. Works as a browser extension .
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.
Biteplay - Create highly targeted Youtube ad campaigns in 5 minutes