Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
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.
Invision - Prototyping and collaboration for design teams
MJML - The open source framework for responsive emails
Sketch - Professional digital design for Mac.
Unlayer - Embeddable email editor and page builder for SaaS and CRMs