sms messaging

Messaging platform for professionals (was TeamASAP).

Cloud-based SMS and file management between OS X and Android.

Free software to send free SMS (and MMS) messages from your Mac

Free voice, video, and messaging service.

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.

Native OS X desktop client for the Yammer messaging service.