What are some alternatives?
When comparing Bopup IM Suite and Signal, you can also consider the following products
Ruler - It's a screen ruler for Windows.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
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.
BORGChat - BORGChat is a LAN messaging software program.
Riot.im - Open source interoperable collaboration app.