ispy is a monitoring program, to monitor what is on the screens of linux computers.
The server program is called "ispy".
The client program is called "my-little-eye". To install with systemd, do the following as root:
apt install git ruby ruby-gtk3 git clone $source.git /usr/local/ispy ln -s /usr/local/ispy/my-little-eye.service /etc/systemd/user systemctl --global enable my-little-eye
The service will start on next login, or can be started with:
systemctl --user start my-little-eye