The best replacement for doubletwist is winamp.

The best alternatives to doubletwist are rated as following:
★★★★★  winamp
★★★★★  isyncr
★★★  google music
★★★  songbird
★★★  tunesync
★★  kies
★★  rocket player
★★  winamp android
★  power amp
★  synctunes
★  easy phone tunes
★  itunes agent
★  play music
★  playerpro
★  audiogalaxy
★  mixzing
★  missing sync
★  doggcatcher
  salling media sync
  easy phone sync
  poweramp

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

Other search terms related to doubletwist and their ratings are:
★★★★★ airsync
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Google Trends

Scale is based on the average worldwide traffic of doubletwist in all years. Click on graph for more.
doubletwist
winamp
isyncr