I used 8 :)
21 😤
Albeit we only used a few assets from each. Sometimes even one or two.
I had a vision that was not covered by any one specific kit so I just mixed and matched.
Despite AssetForge being disallowed we had no shortage of models nor sprites. Just time 🙃
For anyone curious, here is an exhaustive list of all the pack we used in alphabetical order:
# 3D Kits
01. Blocky Characters
02. Car Kit
03. Castle Kit
04. City Kit (Industrial)
05. City Kit (Commercial)
06. City Kit (Suburban)
07. City Kit (Roads)
08. Food Kit
09. Graveyard Kit
10. Mini Characters 1
11. Prototype Kit
12. Retro Urban Kit
13. Space Station Kit
14. Survival Kit
# UI Kits
15. Cursor Pack
16. Emotes Pack
17. Game Icons
18. UI Pack
# 2D Kits
19. Medieval RTS
20. Smoke Particles
21. Splat Pack
Yeah, I also spent a fair bit of time skimming through the preview screenshots to find suitable pieces.
Then I had this elaborate setup on my 2nd monitor for actually bringing the assets in.

In hindsight, I should have just imported literally everything into the project a day before the jam. Then I could have relied on Godot’s built in thumbnails in the file browser.
I was obsessed with only bringing in the assets I actually need, but Godot would have done some tree shaking during export anyway.
48h jams have no room for such “optimizations”
A bit late but I use a file organizer called Eagle to index every game asset I have access to and assign tags to them. It works really well for game dev assets since it can preview audio, models, and textures and lets you search across all of them. I added all the Kenney and Kay Kit packs to it and left it open during the jam in case I needed something.
I used 3 packs in total, 5 if you count audio packs
Sprites:
Audio: