The best replacement for swf is flv.

The best alternatives to swf are rated as following:
★★★★★  flv
★★★★★  fla
★★★★  avi
★★★★  gif
★★★  swc
★★★  tajima
★★  flv files
★★  sqs
★  svg
★  flv which is better
★  flv difference
  gif animation
  .fla
  swz
  barudan
  flv format

Your alternative for swf is not listed? Suggest!
Speaking about swf, one probably shouldn't forget about master cleanse.

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



Google Trends

Scale is based on the average worldwide traffic of swf in all years. Click on graph for more.
swf
flv
fla