The best alternatives to PrepBootstrap are MD Bootstrap, CodeDammit, and BootStarters. If these 3 options don't work for you, we've listed a few more alternatives below.
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MDBootstrap stands for material design for bootstrap. Or in simple word, a version of bootstrap that inspired with Material Designs. MDBootstrap have hundreds of beautiful components, templates, animations, effects and helpers. Everything fully responsive, compatible with different browsers and it is easy to use.