Founded in 2009 by Jan Koum and Brian Acton and acquired by Meta for $19 billion in 2014, WhatsApp has more than 3 billion monthly active users with default end-to-end encryption and WhatsApp Business and API services.
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Viber is an encrypted instant messaging and calling app with over 1 billion registered users, offering end-to-end encryption by default, free HD voice and video calls, and low-cost Viber Out international calling.
Teamwire is an enterprise secure messaging platform founded in 2015 in Munich, Germany, using AES-256 end-to-end encryption with EU-hosted data, GDPR and ISO 27001 compliance and private deployment support.
Flock is an enterprise team messaging and collaboration platform launched in 2014 that combines group chat, HD video conferencing, task management and 150+ app integrations. The free plan supports 20 people; Standard is $4.50/user/month.