Titanium, SoD, SoF, UF (sometimes called HoT), and RoF. RoF was available from Steam, but has since been patched, so no longer works. UF was also on Steam. Titanium, SoF, and SoD were discs and you might be able to finf them on eBay or Amazon. Not all servers support all the clients, so looked that up if you know where you want to play. P99 is Titanium only.
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