messaging service

CalendarCreator.service add events to iCal with ease.

Free voice, video, and messaging service.

Native OS X desktop client for the Yammer messaging service.

Messaging platform for professionals (was TeamASAP).

Business messaging reinvented.

Instant messaging server.

Popular instant messaging client supports a plethora of services.

Encrypted BBS style client for chat, messaging, and transfers.

Highly Secure Email, Chat, Instant Messaging, and Collaboration.

Instantbird is a multi-protocol Instant Messaging client.