The best replacement for tweetcaster is plume.

The best alternatives to tweetcaster are rated as following:
★★★★★  plume
★★★★  tweetdeck
★★★  tweetbot
★★  ubersocial
★★  falcon pro
★★  tweetcaster pro
★★  hootsuite
★★  twidroid
★★  echofon
★  twitter app
★  twitter for android
★  seesmic
★  twicca
★  slices
  twitbot
  twidroyd
  ubertwitter

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