JACK is my favorite program to use while mapping, but it doesn't support prefab objects. This video is all about working around this and using prefab maps and models from TWHL and Gamebanana
TWHL: https://twhl.info/
Gamebanana HL1: https://gamebanana.com/games/34
Gamebanana Goldsource engine: https://gamebanana.com/games/5250
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Timestamps
00:00 Intro
00:26 Using TWHL
02:35 Using your prefab map
04:54 Using gamebanana for models
07:28 Using models in JACK
09:48 Using cycler entity
11:52 Using monster_furniture
13:01 Summary
13:46 Outro