The best replacement for proto is snap on.

The best alternatives to proto are rated as following:
★★★★★  snap on
★★★  dye
★★★  blackhawk
★★  prototype
★★  sl
★★  sk
★  wright
★  armstrong
★  ecto
★  prototype javascript
  mac tools
  dm4
  shocker
  volatile
  nv

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Google Trends

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proto
snap on
dye