Hey everyone, we've been working hard recently to prepare this tool for Unreal Engine. It's a Spline tool with features geared towards Environment artists and Level designers. Check out the product here: https://www.unrealengine.com/marketplace/en-US/product/spline
The are many unique things you can do with it. Some of these features I've been wanting to have for a long time in my projects. So I hope you can benefit from them as much as I have!
For everything else, check out the voyager website https://www.voyager3d.net/
Cheers!