Twilio - Brings voice and messaging to your web and mobile applications.
Whappext - Whappext is an online marketing platform that helps users to send bulk messages to millions of users for the marketing of their brands.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Viking Whatsapp Tools - Viking Whatsapp Tools is a platform that helps businesses to sell on WhatsApp and build an effective sales strategy.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
WAAM-it Sender - WAAM-it Sender is a WhatsApp marketing software that enables users to send messages from their system and smartphones anytime, anywhere.