nodemailer is a module for node.js applications to allow easy as cake email sending. the project got started back in 2010 when there was no sane option to send email messages, today it is the solution most node.js users turn to by default.

realm is an open source object database management system, initially for mobile operating systems but also available for platforms such as xamarin, react native, and others, including desktop applications, and is licensed under the apache license.

talkjs is a developer friendly chat api with a pre-built ui that is highly customisable. you can build a chat feature in minutes instead of months.