Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
:dango: An interactive and responsive charting library
calendar and datepicker directives for angular
jQuery Form Plugin
Customizing Form Valid Message in AngularJS
Probably the most opinionated framework in the world
Accessible rating forms with cute animations on top.
Email domain spelling suggester
A jQuery plugin that provides auto tabbing and filtering on text fields in a form
A cross browser rich text editor with an API
Performance-focused API for React forms 🚀
🌑 Dark mode made easy
Modern progress bar for form completion.