TubeBuddy (keyword optimization)

I’ve just recently discovered TubeBuddy.
 And it’s become one of my go-to tools to complete the SEO of my videos.
TubeBuddy was developed for YouTubers to manage their channels and everything around it. Nevertheless, it offers great features for video SEO in general, like exploring your competitors’ video tags.

It’s available as a plugin for Google Chrome and will save you loads of time when optimizing your YouTube videos.