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For non-Valve games and mods, consult the mod website.Sven Co-op: Check your Steam installation, the FGD is included at /Steam/steamapps/common/Sven Co-op/svencoop/sven-coop.fgd.Counter-Strike: Condition Zero Deleted Scenes FGD.Goldsource Games FGD Collection - All official Valve games in one convenient file, including Half-Life, Counter-Strike, Opposing Force, etc.In order to use an editor for more than empty rooms, you'll need a FGD! An FGD file contains the definitions of the entities in a game/mod so you can create a map for it, and actually use the entities of the corresponding game. Unfinished and rather unstable, although you can use a fork of it called HammerTime which is actively supported and new features are being added very frequently. Sledge Editor - A free, open-source replacement for the Hammer Editor that's no longer being actively developed.GtkRadiant 1.4 or 1.5 - Half-Life has never been a big focus of the GtkRadiant project, and support for it has been removed in version 1.6.Don't forget to install the required addons to enable mapping for your chosen HL mod. Quark - The Quake Army Knife, another tool aimed at being a universal editor.Valve Hammer Editor 3.5 - The final version of the original, official Goldsrc editor, including model support and Prefab Support.TrenchBroom has an excellent manual to assist with that, and a lot of the Quake based Tutorials will still help. A very stable application that is being updated often, but is very different to Hammer, which will make most tutorials difficult to follow. Doesn't currently render sprites in the editor, but otherwise fully works for Half-Life mapping. TrenchBroom - A Quake editor that has support for Half-Life as well.Use other supported formats in the meantime. Third party tools that supported the JMF format may break until patched. If you're using the free version, please update to the latest version. A late December 2023 update to Steam J.A.C.K., and early January 2024 to the free version, created breaking changes to J.A.C.K.'s native JMF format.