How to repair an STL file now 3D Tools has been retired?

Hi, can anyone recommend a program that will repair STL files? I was using the https://tools3d.azurewebsites.net but it’s a while since I printed anything and I’ve just seen that the service has been retired.

Both free and more updated

https://www.meshmixer.com/

https://www.meshlab.net/

I will check those out. Thank you @Michael_Pryor . That’s much appreciated.

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