Vero - Email platform for product, marketing and engineering teams
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Mailgun - A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Aritic Mail - Ariticmail is a transactional email delivery API for applications and enterprises.
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!