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TrenchBroom
From Quake Wiki
Trenchbroom is a recent level editor for Quake programmed and maintained by SleepwalkR. It uses a single 3D view with no 2D views, and boasts some very handy vertex manipulation. Website
Features
General
- Full support for editing in 3D and in up to three 2D views
- High performance renderer with support for huge maps
- Unlimited Undo and Redo
- Macro-like command repetition
- Issue browser with automatic quick fixes
- Point file support
- Automatic backups
Brush Editing
- Robust vertex editing with edge and face splitting and manipulating multiple vertices together
- Clipping tool with two and three points
- CSG operations: merge, subtract, intersect
- UV view for easy texture manipulations
- Precise texture lock for all brush editing operations
- Multiple texture collections
Entity Editing
- Entity browser with drag and drop support
- Support for FGD and DEF files for entity definitions
- Mod support
- Entity link visualization
- Displays 3D models in the editor
- Smart entity property editors
Tutorial
See Getting_Started_Mapping for a beginners guide to using Trenchbroom, that also covers a lot of the basics of general Quake mapping. Note that this tutorial is a bit outdated as many things have changed in Trenchbroom 2.0.