Description: Mailman is an open source mailing list management system. It helps manage email discussion and announcement lists, allowing users to subscribe and unsubscribe, and helping admins moderate and post to the lists.
Type: software
Pricing: Free
Description: Twilio is a cloud communications platform that enables developers to programmatically make and receive phone calls, send and receive text messages, and perform other communication functions using its web service APIs.
Type: software
Pricing: Paid