Bootstrap UI Kit

Bootstrap 3 Vector UI Kit for Sketch

19 Alternatives To Bootstrap UI Kit

Ayro UI

Bootstrap UI Kit for startup and SaaS business

Based UI

Sketch UI kit for feeds on iOS, Android and web

Bootstrap 4 Cheat Sheet

An interactive Bootstrap 4 cheat sheet

Bootstrap Shuffle

Bootstrap builder for busy developers

Bots UI Kit

Fully customizable Sketch UI Kit for Messenger Platform
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Chat UI kit by InVision

A beautifully minimal app UI kit (Sketch & Photoshop)
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Epic Pxls

UI kits, icons, templates, mockups and more, free

Get Shit Done

Free Bootstrap 3 UI kit

Landing UI Kit

Handcrafted UI components for landing pages

Material Kit

A badass Bootstrap UI Kit based on material design
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NOW UI kit by InVision

A beautiful cross-platform UI kit (PSD & Sketch)

Now UI Kit

A beautiful Bootstrap 4 UI kit. Yours free.

Phoenix Startup UI kit

Powerful cross-platform UI Kit (PSD & HTML5)

Platforma Flowcharts

Collection of cards for website and app prototyping

RELATE

Relate is an Environment for Learning And TEaching
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Yosemite UI Kit

Most comprehensive Yosemite UI Kit designed for Sketch

iOS 10 UI Kit

A massive UI kit for iOS 10 (PS & Sketch)