POWr - POWr is a library of free and customizable forms, galleries, social streams, e-commerce, countdowns, and more.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Zendo - Zendo allows you to sell productized, subscription and custom services. Collaborate and collect payments. Create quotes and invoices. Eliminate multiple tools and enjoy the simplicity.
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.
jQuery - The Write Less, Do More, JavaScript Library.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.