Typehead.js is a great project open-sourced by Twitter. It can function both with remote or local datasets and is speed-optimized and build smart form fields that are auto-complete.
Typehead.js
Related Plugins
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1 FitText
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2 Hook
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3 Fancy Input
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4 FitText
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5 Scrolld.js
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6 Velocity.js
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7 Lettering.js