www.aweber.com: Free Autoresponder for 30 days. One of the original Autoresponder providers! Also one of the best with a very reliable service at very affordable rates. This is a great option if you really want a professional Autoresponder that is affordable! Currently, they are offering a 30-day trial where you can test out the full features of the Autoresponder service for a month.
Drip offers a very small forever free plan, along with a two-week free trial for the Basic and Pro membership levels. If you choose to continue service after those two weeks, then your card will be charged. There is a 30-day refund window from when you start your service, but it’s up to the discretion of Drip whether you will receive a full refund.