Open source plugins. Free to use, free to fork.
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Forms
importly
CSV and spreadsheet column-mapping UI for file inputs
Demo
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Forms
rankchoice
Multi-select that captures choices and the order users rank them
Demo
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Forms
chatter
Google-Docs-style comments on any editable element
Demo
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Forms
croppy
Image cropper for file inputs; the form submits the cropped result
Demo
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Forms
uploady
File uploads with review, rename, and remove before submit
Demo