From Valve Developer Community
Sandpit is a sandbox mod for the Half-Life.
- Spawn menu - a selection of Half-Life monsters can be spawned.
- Custom HUD - the HUD can be changed to any RGB colour.
- Deathmatch bot
- Support for a variety of entities from GoldSource engine games.
- Ability to add glowshells to spawned models
- Model spawn menu
- Tool menu
- Deathmatch, King of the Hill and Time to Choose multiplayer gamemodes
- Support for a few entities from 1st party GoldSource engine games (except 007 Nightfire)
- Detail textures for Half-Life deathmatch maps