jQuery standalone tristate (indeterminate) checkbox with pseudo selectors and optional value modification and .val() overwrite. Standalone, so usable for purposes other than list/tree marking.
Library for checking multiple checkboxes by click-and-dragging over them. Paint your selection!
Use input/select or toggle buttons to control UI elements
Interactive, accessible toggle switches for the web.
Fully customizable animated bouncy checkbox for React Native
Read and write values to a state object and listen for changes at any given path
Provides the semantics for a nested list of tri-state checkboxes, using the HTML5 "indeterminate"...
A polyfill for the element internals specification
React component library for variable setting and preview.
Dual and triple-state toggles for AngularJS
Miraculous :checked pseudo-class polyfill (for IE8 and below)
UI knobs controllers for JS/CSS live manipulation of various parameters
Tracks pristine/dirty state of in-browser form controls