MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Zeplin - Collaboration app for UI designers & frontend developers
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Abstract - A secure, version-controlled hub for your design files