MJML - The open source framework for responsive emails

Rebrandly - Rebrandly is the easiest way to create, share and manage branded links.

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.

Bitly - Get the most out of your social and online marketing efforts. Own, understand and activate your best audience through the power of the link with Bitly Enterprise.

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

Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.