Whappext - Whappext is an online marketing platform that helps users to send bulk messages to millions of users for the marketing of their brands.
Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
Viking Whatsapp Tools - Viking Whatsapp Tools is a platform that helps businesses to sell on WhatsApp and build an effective sales strategy.
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.
WAAM-it Sender - WAAM-it Sender is a WhatsApp marketing software that enables users to send messages from their system and smartphones anytime, anywhere.
Kannel - Open Source WAP and SMS Gateway