The best replacement for sql developer is toad.

The best alternatives to sql developer are rated as following:
★★★★★  toad
★★★  sql navigator
★★★  sql plus
★★  jdeveloper
★★  .net developer
★★  pl sql developer
★  pl/sql developer
★  sql developer
★  dbvisualizer
★  mysql workbench
★  sqlplus
  pl\/sql developer
  toad oracle
  sql express

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Speaking about sql developer, one probably shouldn't forget about oracle 11g.

Other search terms related to sql developer and their ratings are:
★★★★★ oracle 11g
★★★★ data modeling
★★★★ tnsnames.ora
★★★★ oracle client
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sql developer
toad
sql navigator