The jQuery scroll2Section plugin lets you create a sticky navbar that smoothly scrolls the page to specific content sections while highlighting the current nav item.
The jQuery OWL Tube plugin makes use of the popular Owl Carousel 2 plugin to create a responsive, configurable Youtube playlist carousel from a group of Youtube videos you specify.
A Youtube lazy loader plugin with jQuery that replaces the default Youtube player with its cover image and loads actual YouTube videos ONLY when needed (click the thumbnail).