Tox protocol.
• Tox is a protocol for decentralized text, voice and video communication on the Internet based on asymmetric encryption.
• Tox uses NaCl encryption for cryptography, and the developers called it experimental. Encryption occurs for each message. It is also worth mentioning that the messages do not contain metadata, which is important because metadata is used as a way to track users. Your data is stored only on your device.
• There are many clients available for Tox. The most popular desktop applications: tox and qTox