PaPCo has been installed at various sites and there has been quite some commitment by the ISTP POLAR community to use it as it's main data display and analysis package. Discussions are underway for its use in the EQUATOR-S and CLUSTER mission. PaPCo should grow as more people program in it - and as more modules become available, the return on investment on PaPCo by far outweighs the investment in time in it!
This list of institutions is constantly growing and is maintained on the PAPCO home page which is part of the CCR Web site. The CCR Web page is also mirrored at RAL, United Kingdom.