TemplateMo - TemplateMo is a great place to get bootstrap templates from your website, which are all HTML5 supported with CSS layout.

Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.

Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.

MJML - The open source framework for responsive emails

CoinList - Build a diverse portfolio of pre-launch token investments

Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.