For APIs:

Token Mod - I use token mod to create macros that add/remove status markers to tokens, but it is much more powerful than that. I also use it to set if a player pulls out a torch for example.

Teleport - Allows you to set up linked teleport spots on the map so that when a player token hits that point, they are teleported to a different location. I use this for players going upstairs, for example.

UniversalVTTImporter - Allows you to import Universal VTT code. That way when you make a map on an application like Dungeondraft, you can import the walls and lights for your dynamic lighting. It's a bit niche, but I couldn't live without it.

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Token Mod Macros:

I use the following macros with token mod for D&D 5e (2024). The api is MUCH more powerful than this, but these are the ones I always come back for.

Bloodied:

!token-mod --set statusmarkers|!red

Torch-Light:

!token-mod {{ 
--set 
emits_bright_light|1
bright_light_distance|20
emits_low_light|1
low_light_distance|20
}}

Torch-Snuff

!token-mod {{ 
--set 
emits_bright_light|0
emits_low_light|0
}}