The best replacement for moq is nsubstitute.

The best alternatives to moq are rated as following:
★★★★★  nsubstitute
★★★★★  fakes
★★★★  rhino mocks
★★★★  nmock
★★★★  fakeiteasy
★★★★  nunit
★★★★  justmock
★★★  automoq
★★  moles
★★  mpq
★  typemock
  spq

Your alternative for moq is not listed? Suggest!
Speaking about moq, one probably shouldn't forget about ninject.

Other search terms related to moq and their ratings are:
★★★★★ ninject
★★★★ nunit
★★ mstest
You have in mind a companion for moq and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of moq in all years. Click on graph for more.
moq
nsubstitute
fakes