Many mods allow you to input ID-s of buildings or elements in their configs, but if you don't have access to the decompiled game files it can be difficult to come by what can you exactly enter.
I made a quick website to have the ID-s of most things in game available publicly: https://aki-art.github.io/oni-ids/
Mod users: use this list to find ID-s of things, for mods like Configurable Build Menu or Customize Geyser.
Mod creators: you can link pages as aid for your config files.
If Klei thinks this is not something to be shared please let me know. This page is intended purely for mod configuration help, and for those making worldgen mods to be able to access prefab tags without having to deal with C# code.