The best replacement for cleverbot is cleverbot.

The best alternatives to cleverbot are rated as following:
★★★★★  cleverbot
★★★★  jabberwacky
★★★  omegle
★★★  simsimi
★★★  smarterchild
★★  eliza
★  akinator
★  igod
  existor

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Speaking about cleverbot, one probably shouldn't forget about pewdiepie.

Other search terms related to cleverbot and their ratings are:
★★★★★ pewdiepie
★★★★ evie
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Google Trends

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jabberwacky