Netfabb basic Mac alternative

I just got a new Mac with the latest OS and I found out that my Netfabb Basic no longer works and they stopped supporting it on Mac.

I used it all the time to fix models. I tried the online version but a lot of the time I get random errors saying model would not upload and when they do they just seem to disappear (no trace of them online and no message telling me they are done).

Is there another Mac tool (free or not) that easily fixes models?

Thanks

The online netfabb seems to get hammered sometimes or something. Usually uploading the model again will let it go through.

Slic3r PE is able to repair many common problems and you can export the repaired STL.

MeshMixer and MeshLab both have Mac versions.

FreeCAD's mesh workbench also has analysis and repair, manual, auto and reiterative auto.