OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Gumroad - An all-in-one solution to sell your work and grow your audience.
Marketo - Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.
Sellfy - Sellfy is an easy to use but powerful e-commerce platform where you can sell digital, print on demand or subscription products. Use a Sellfy storefront to create a beautiful online store or embed a Sellfy shopping cart to your own website.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.