Vide - No longer actively maintained.

•    Javascript

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No longer actively maintained. I am not interested to maintain jQuery plugins anymore. If you have some fixes, feel free to make PR.Easy as hell jQuery plugin for video backgrounds.

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layerJS - layerJS: Javascript UI composition framework

•    Javascript

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layerJS is an open source Javascript UI/UX library allowing intuitive, visually intense, mobile app-like experiences for web apps and websites. layerJS follows the idea that any kind of interactive web content is composed of media elements on moving layers. Unlike existing UI frameworks, layerJS does not provide various UI elements (use your favorite framework for that) but focusses on how larger blocks are put together to form websites and apps and how these blocks will behave upon user interaction.

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Blueprint - Declarative UI construction for iOS, written in Swift

•    Swift

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Blueprint greatly simplifies the task of building and updating views as application state changes. We still consider Blueprint experimental (and subject to major breaking API changes), but it has been used within Square's production iOS apps.

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Declarative-Widgets

•    JQuery

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A simple means of declaratively specifying options for widgets built with the widget factory.

jquery-plugin widget factory declarative ui

lustro - A reactive, declarative, immediate mode WebGL UI framework

•    Javascript

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A reactive, declarative, immediate mode WebGL UI framework

reactive declarative webgl ui