Signal is a free, secure, and open-source messaging app that lets you send messages and make calls. It’s like WhatsApp, but Open Source and not owned by a billionaire.
TKB: Maths, Museums & Learning
Mathematics – Heritage – Education
Signal is a free, secure, and open-source messaging app that lets you send messages and make calls. It’s like WhatsApp, but Open Source and not owned by a billionaire.