Hammer++
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Hammer++ is a community-made modification of the Valve Hammer Editor for Source that provides an updated, more stable, feature-rich version of the editor. The trailer and website can be found here.
Hammer++ currently supports the following branches of the Source engine:
Counter-Strike: Global Offensive (does not work for 
CS2, only CS:GO through csgo_legacy branch, so it is essentially deprecated for that use. Still usable for 
and 
however, as well as third-party games running on CS:GO branch.)
Team Fortress 2
Counter-Strike: Source
Source 2013 Multiplayer
Source 2013 Singleplayer
It is also included with 
Military Conflict: Vietnam, in lieu of vanilla Hammer.
Other games/mods tested
Main article: Hammer++/Docs/Installation for Other Games
Features
- Accurate lighting preview
- Upgraded graphic fidelity
- Significantly better stability
- Particle rendering
- 2D + 3D skybox preview
- New model browser, particle browser, color editor, and keybinding editor
- Realtime display of fog and ropes
- Variety of new tools such as physics simulation, gizmo manipulation, drawing of polygon shapes, and convex brush merging
- New func_instance tools
- Quality of life improvements
- ... and much more!
A more detailed feature list can be found on the website and you can support ficool2 via Ko-fi
Caveats
Warning:Does not support some features from 
Hammer 4.x, such as "Convert WAD to VMT...", or loading GoldSrc ".MAP" files directly.
Bug:Always uses Windows's high-DPI scaling setting, even when scaling override mode is set to "Application" in 
File Explorer's compatibility settings for 
hammerplusplus.exe. This can result in less real estate than Hammer 4.x, depending on Windows settings. [todo tested in ?]Additional bugs can be found in the official issue tracker, which is no longer maintained.