Want to implement real-time pcg city tools with diverse user interactions like this demo by JUST using Houdini HDA?
Here are some plugins may help:

https://github.com/AdrianPanGithub/HoudiniEngineForUnreal [github.com]
Completely remaster of official HoudiniEngineForUnreal from zero
- Up to 2x - 40x faster data I/O.
- Provides C++ API for writing your custom data I/O translators.
- Allow Only using HDA to achieve rich and complex interactions inside unreal editor.
- Native UE5 world-partition(one-file-per-actor) support, without baking!
- ...(Much more functionalities for making procedural terrain and city tools in unreal)

https://github.com/AdrianPanGithub/HoudiniMassTranslator [github.com]
Real-time mass zone graph traffic data translator, based on my custom Houdini Engine.
Tutorial: https://youtu.be/HAM8_OP_Fyc?si=ppp9v2Ti1BqPQC4b [youtu.be]

https://github.com/AdrianPanGithub/HoudiniPackage [github.com]
Some small parts of my daily-used houdini accessories for making real-time procedural city and terrain tools.

All of them support unreal 5.5 - 5.3 and later, and all builds of Houdini 20.5.
And if you encounter any issue, please report on GitHub, So I’ll see it.

Also thanks for the advice and bug reports from VFX-沐月 and inspirations from _smile滴水C long long ago.