Quill
A cross browser rich text editor with an API
Alpine
A rugged, minimal framework for composing JavaScript behavior in your markup.
Selectize.js
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.
Filepond
🌊 A flexible and fun JavaScript file upload library
Zxcvbn
zxcvbn, named after a crappy password, is a JavaScript password strength estimation library. Use it to implement a custom strength bar on a signup form near you!
Angular Validation
Customizing Form Valid Message in AngularJS
Form2js
Javascript library for collecting form data
Tsparticles
tsParticles - Easily create highly customizable particles animations and use them as animated backgrounds for your website. Ready to use components available for React.js, Vue.js (2.x and 3.x), Angular, Svelte, jQuery, Preact, Inferno, Solid, Riot and Web Components.
Switchery
iOS 7 style switches for your checkboxes
Unform
Performance-focused API for React forms 🚀
Fancy Input
Makes typing in input fields fun with CSS3 effects
Sisyphus
Gmail-like client-side drafts and bit more. Plugin developed to save html forms data to LocalStorage to restore them after browser crashes, tabs closings and other disasters.
Resumable.js
A JavaScript library for providing multiple simultaneous, stable, fault-tolerant and resumable/restartable uploads via the HTML5 File API.
Angular Formly
JavaScript powered forms for AngularJS
Taggle.js
Form-ready dependency-less tagging.
React Editext
Editable Text Component for React Apps
Formbuilder
[Needs Maintainer] Formbuilder is a small graphical interface for letting users build their own webforms.