The best replacement for bluecoat is websense.

The best alternatives to bluecoat are rated as following:
★★★★★  websense
★★★★  riverbed
★★★  ironport
★★★  barracuda
★★★  commtouch
★  checkpoint
★  isa
★  zscaler
  tmg
  isa server
  netcache
  allot
  isa 2006

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

Other search terms related to bluecoat and their ratings are:
★★★★★ websense
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Google Trends

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bluecoat
websense
riverbed