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Free HTML Email Templates created using the Postcards - https://designmodo.com/postcards/
Flat UI Free - Design Framework (html/css3/less/js). Flat UI is based on Bootstrap, a comfortable, responsive, and functional framework that simplifies the development of websites.
Free HTML Website Templates created using the Slides - https://designmodo.com/slides/
Startup Framework 2.2 Free — Beautiful framework based on Bootstrap 4.0 (html/css/scss/js/sketch/psd).
Demo Version of Startup Framework