Lookback - See how people really use your app
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Dovetail - Mobile Cloud-Based Dental Software
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Preely - Remote user testing and rapid prototyping
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.