sms messenger

Open-source Facebook Messenger app.

Secure instant messenger.

Chat with your Facebook friends on your Mac.

MSN chat client.

Jabber/XMPP chat client.

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

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

Easy, no-cost messenger.

Top Secret Messenger.

Internet phone and instant messenger (was SIP Communicator).