The best replacement for megui is staxrip.

The best alternatives to megui are rated as following:
★★★★★  staxrip
★★★★  handbrake
★★★  ripbot264
★  ripbot
★  virtualdub
★  mediacoder
★  gordian knot
  autogk
  automkv
  avidemux

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

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



Google Trends

Scale is based on the average worldwide traffic of megui in all years. Click on graph for more.
megui
staxrip
handbrake