What are some alternatives?
When comparing Mini WA+ and Voxer, you can also consider the following products
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Unitely - Unitely provides visualization of communication flow enabling organizations to take corrective actions and create more efficient teams.
Zulip - Powerful open source group chat
NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.
Tinode - Tinode Instant Messaging
Get A Room - Conference room booking system