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Those are in the various Record Sheets. Catalyst has several available for download for free, plus more for pay. You can also get all of them with MegaMek Labs or Solaris Skunk Works. Flechs Sheets is an option, but only covers bipedal 'Mechs; no vehicles, aerospace, infantry, LAMs, Quad-Vees, quad or tripod 'Mechs.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.