The best replacement for aldiko is moon+.

The best alternatives to aldiko are rated as following:
★★★★★  moon+
★★★★★  fbreader
★★★  mantano
★★★  cool reader
★★  google books
★★  google play books
★★  moon reader
★★  laputa
★  play books
★  bluefire
★  kindle app
★  ezpdf
  calibre
  mantano reader
  stanza
  kobo android

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

Other search terms related to aldiko and their ratings are:
★★★★★ calibre
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Google Trends

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aldiko
moon+
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