Remmina - Remmina is a remote desktop client written in GTK+, aiming to be useful for system administrators and travellers, who need to work with lots of remote computers in front of either large monitors or tiny netbooks.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
rdesktop - rdesktop is a free and open source remote desktop protocol client designed to make the users able to manage their PCs in a new way.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
KRDC - KRDC is the KDE Remote Desktop Client.
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.