VTube-LASER - Recommended STL File Editor - MeshLab (Free)
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The MeshLab editor allows you to decimate (reduce the point count) for very dense STL files. It's our favorite because it is easy and works great.

https://sourceforge.net/projects/meshlab/
(Note: This is a free software package. Users often complain about this program's issues. But we only use it for one purpose. It works great for our decimation application.)