Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.

Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES

Eduflow - Digital learning that actually teaches students something

Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates

Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.