The best replacement for zing is cameo.

The best alternatives to zing are rated as following:
★★★★★  cameo
★★★  ping zing 2
★★★  ping eye 2
★★★  zulu
★★  scan n cut
★★  eye 2
★★  silver bullet
★★  silhouette cameo
★★  jrockit
★★  anser
★★  isi
★  ecraft
★  zing 2
★  black cat cougar
★  ping isi
★  ping eye
  wing ding

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Speaking about zing, one probably shouldn't forget about shreya ghoshal.

Other search terms related to zing and their ratings are:
★★★★★ shreya ghoshal
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zing
cameo
ping zing 2