Let's take a look at few such offerings that are increasingly top of mind with today's 'Net professionals and what they can provide enterprises willing to impliment.
Carousel's have fallen out of favor over the past year, but they remain a useful addition to any website when designed and implemented well. Slick provides all the neccessary front-end functionality and capabilities - responsive, looping, navigation - designers are looking for if considering a carousel on their digital property.
Another form related library worth a look is Cleave.js which helps designers (form developers) format content as a user types - changing a string of numbers, for example, into a proper area code and phone number: i.e. 1234567890 into (123) 456-7890. Not only is it a welcome addition for users but is an excellent way to ensure that any data received through forms is consistent in nature.