Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images.
Bigtent - BigTent is a web-based organization and communication portal for groups.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
MailEnable - MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.