Boomerang Respondable - Write perfect emails with Artificial Intelligence

Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.

Mailbutler - Mailbutler adds lacking functionality to email clients and increases your productivity

Bigtent - BigTent is a web-based organization and communication portal for groups.

Boomerang for Gmail - Boomerang for Gmail is a Firefox / Chrome plugin that lets you take control of when you send and receive email messages.

Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.