The best replacement for quicktime 7 is quicktime x.

The best alternatives to quicktime 7 are rated as following:
★★★★★  quicktime x
★★  quicktime pro
★★  quicktime 10
★  quicktime player
  quicktime

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Speaking about quicktime 7, one probably shouldn't forget about itunes 6.

Other search terms related to quicktime 7 and their ratings are:
★★★★★ itunes 6
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