The best replacement for twixtor is twixtor pro.

The best alternatives to twixtor are rated as following:
★★★★★  twixtor pro
★★★★  kronos
★★★★  timewarp
★★  optical flow
★★  fcpx optical flow
★★  slowmovideo
★★  pixel motion
★★  cineform
★  time remap
★  motion
★  fluid motion
  apple motion
  motion optical flow
  retimer
  time warp

Your alternative for twixtor is not listed? Suggest!
Speaking about twixtor, one probably shouldn't forget about after effects.

Other search terms related to twixtor and their ratings are:
★★★★★ after effects
★★★★★ final cut pro
★ 24p
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Google Trends

Scale is based on the average worldwide traffic of twixtor in all years. Click on graph for more.
twixtor
twixtor pro
kronos