Yrex Tools
http://www.oldunreal.com/cgi-bin/yabb2/YaBB.pl?num=1440262425/0#0

The Y_Tools package contains:

Yrex Tools BrushBuilder which contains actions:
- MoveBrushToCam - places red brush in front of camera.
- MoveActorToCam - moves selected actor in front of camera (only one actor).
- FindActor - moves camera near selected actor.
- FindZoneInfo - moves camera near ZoneInfo actor.
- WhoTriggersHim - finds actors which trigger selected actor.
- MirrorX/Y/Z - can be used to mirror group of brushes. Changes Location, MainScale if rotation==0, PostScale otherwise, DrawScale3D in case of meshes (rotation must be 0).

Class Y_Ruler which allows to measure length between two walls from inside or outside. The length is approximate, so e.g. 1023 should be treated as 1024.

Class Y_BSPHoleDetector which allows to detect two types of BSP holes:
- instant killing hole, which appears when no collision is placed between zero zone and normal zone.
- invisible collision. This detection is prone to false positives if wall is thinner than detector's step size or in case of semisolids.

Class Y_BSPDetector which can:
- find fragments of zone 0
- find fragments of zone specified by number
- find fragments of zone specified by ZoneInfo
- show all zones in given place
This way you can check for example zone leaks.

Download: https://sites.google.com/site/mojunreal/y_tools.7z