choices.js
A vanilla JS customisable text input/select box plugin
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Get a date with JavaScript! A datepicker with no dependencies.
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Image resizing using mouse wheel (pinch to zoom) + drag scrollable image (as well as any HTML content)
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A simple, easy to use vanilla JS color picker with alpha selection.
autocompleter
Blazing fast and lightweight autocomplete library without dependencies. 1KB gzipped.