It's the same 'Actia XS Evolution' interface for Peugeot and Citroen. For elder Citroens like Xsaras you use the software Lexia3 and for elder Peugeots PP2000. For later models you use the software DiagBox for both Peugeot and Citroen (same interface).
Keep in mind that most available interfaces are chinese clones. If you buy a new interface and you want to be somehow future-proof, be sure it is an accurate clone as there exist(ed) clones with parts left out or with cheaper transistors where there should be relays.
Also ensure the interface supports a current version of DiagBox so you're not limited to elder models if you want to diagnose a modern car as well. When I got mine in 2012 all the clones had the same firmware and serial number flashed. Thus it was easy for PSA to block these interfaces in newer versions of DiagBox. However, some of these could be 'originalised' by reflashing and assigning a random serial number. Search for 'pp2000 lexia "nlc"' and you should find something, if needed. Nlc is a French speaking user in some car diagnostics forums who afaik first made originalising of these interfaces possible.
Apart from that I would not use supplied CDs as they are infected with malware often. There are ways to get a fresh and current cracked version of DiagBox (and PP2000/Lexia anyway).