The best replacement for bitesms is messages+.

The best alternatives to bitesms are rated as following:
★★★★★  messages+
★★★★★  couria
★★★★  imessage
★★★★  irealsms
★★  courier
★★  sms
★  handcent
★  irealsms 3.0
★  sms+
★  quickreply
  tlert
  chompsms

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

Other search terms related to bitesms and their ratings are:
★★★★★ intelliscreenx
★★★ lockinfo
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Google Trends

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bitesms
messages+
couria