Dayon! allows watching and controlling remote computers. It can be used as free alternative to various commercial remote desktop and remote assistance products.

Its key features are

• no router or network configuration required on the assisted side
• friendly, multilingual (de/en/es/fr/it/ru/sv/tr/zh) user interface
• secure, end-to-end encrypted communication (TLS1.3)
• trustworthy, privacy preserving open source
• completely free, also for commercial use
• very low bandwidth usage
• assistant and assisted functionality in one package
• cross platform support