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
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Bigtent - BigTent is a web-based organization and communication portal for groups.
DuoCircle - DuoCircle provides enterprise spam filtering and email management solutions.
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.