Plutonium is the largest modded CoD client, covering World at War, Black Ops, Black Ops II and Modern Warfare 3 with dedicated servers, mod tools and Zombies co-op.
Download PlutoniumClients keeping Call of Duty online
Official servers for these titles were shut down or never supported browsing at all. Each client below fills that gap for a slice of the series, covering 18 titles between them. Or browse by title instead.
6 clients
IW4x is the long-running Modern Warfare 2 client, running its own master server and dedicated server list for the 2009 multiplayer.
Download IW4xAlterWare maintains clients for Ghosts, Advanced Warfare and Black Ops III, adding dedicated server browsing to titles that shipped matchmaking-only.
Download AlterWareAurora covers Modern Warfare Remastered and Infinite Warfare, restoring server browsing and co-op to both 2016 titles.
Download AuroraHorizonMW is the actively developed successor to H2M-Mod, adding multiplayer to the MW2 Campaign Remastered client.
Download HorizonMWCoD4x is a server and client extension for Call of Duty 4, and the reason 2007 CoD4 still has a populated server list.
Download CoD4x