A new version of the free MeshLab was released, just before Halloween.
Mostly used for poly-reduction of 3D meshes, for many. “Quadric Edge Decimation” is what you want there.
Bear in mind that the two new versions in 2021 have bjorked every Meshlab tutorial ever written on smoothing, as all the relevant filters are either removed or differently-named or put somewhere else. The solution is to go get Meshlab 2016 which is still available and is what the old tutorials were written for.