Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Dashboard UI Kit - A modern & responsive dashboard UI kit for designers.
SocialSizes - Sketch templates for sharing images & videos on social media
Landing UI Kit - Handcrafted UI components for landing pages
Platforma Flowcharts - Collection of cards for website and app prototyping
Shards UI Kit - A free and modern UI kit based on Bootstrap 4.