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.
OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Vendasta Technologies - Vendasta is an agency in a box with white label platform, marketing automation and more. Details in here: https://www.vendasta.com/pricing
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
PrestaShop - Create your online store with PrestaShop's free shopping cart software. Build an ecommerce website for free and start selling online with hundreds of powerful features.