BulkSMS - SMS messaging service provider offering two-way SMS communication services.

Twinme - Twinme – Private Messenger is a free, secure, instant, and high-definition messaging app that protects your privacy along with giving you full control over each of your relationships and contents.

Postscript - Like Mailchimp for SMS

Textra - Textra is a seriously beautiful, feature rich SMS and MMS app.

Ansarada - Turn deal chaos into order with Ansarada’s Virtual Data Room.

Material Messaging - Material Messaging is a beautiful communication app that lets you send and receive SMS and MMS messages using the intuitive interface while giving you complete control over every aspect of your messaging experience.