Rossmanith GmbH released the first version of TeamViewer software in 2005, at that time still based on the VNC project. TeamViewer is the core product of developer TeamViewer AG. It has been installed on more than two billion devices. TeamViewer is proprietary software, but does not require registration and is free of charge for non-commercial use. It was first released in 2005, and its functionality has expanded step by step. TeamViewer is a remote access and remote control computer software, allowing maintenance of computers and other devices. Windows, macOS, Linux, Android, iOS/ iPadOS