The best replacement for discoverer is business objects.

The best alternatives to discoverer are rated as following:
★★★★★  business objects
★★★★  obiee
★★★  xml publisher
★★★  bi publisher
★★  general grabber
★★  goodyear wrangler
★  bridgestone dueler
★  crystal reports
★  yokohama geolander
  oracle reports
  city navigator

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Speaking about discoverer, one probably shouldn't forget about oracle apps.

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