IPVanish

An application was installed on Petronella Osgood's computer by 10 May 2020. Its logo was a black rounded square with a white "P" with green rounded squares spreading off upwards and to the left from the "P", and the surface beneath the "P" had a green circle around it. (WC: The Zygon Isolation)

Behind the scenes
While the application was not named in WC: The Zygon Isolation, the application was named "IPVanish", or "IPVanish VPN" in the real world, and was a VPN service.