Services like AnonyTun or Private Internet Access are frequently categorized under this term to help users bypass censorship and hide their IP addresses.
Remote servers used for high-speed uploading and downloading of files. Since the transfer happens on the remote server rather than your home connection, it provides a layer of anonymity from ISPs.
There is a subset of content labeled "Anonyme" (Anonymous) that refers to the aesthetic, specifically the Guy Fawkes mask.