MailStore - MailStore Home - A 100% free single-private-user desktop solution
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Hornetsecurity Email Archiving - Hornetsecurity Email Archiving is one of the advanced software that offers long-term, unchangeable, and secure storage of important company information, data, and flies.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Intradyn Email Archiver - Orca Email Archiver provides email archiving solution for local government and business.
Google Cloud Functions - A serverless platform for building event-based microservices.