The best replacement for tableau is qlikview.

The best alternatives to tableau are rated as following:
★★★★★  qlikview
★★★★★  spotfire
★★★★  excel
★★★★  microstrategy
★★★  lumira
★★★  cognos
★★★  business objects
★★  power bi
★★  sas
★★  pentaho
★★  splunk
★★  obiee
★  domo
★  powerview
★  dundas
★  ssrs
★  birst
  tableaux
  d3
  gooddata
  crystal reports
  xcelsius
  powerpivot
  jaspersoft
  performancepoint
  excel 2013
  qlik

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Speaking about tableau, one probably shouldn't forget about r.

Other search terms related to tableau and their ratings are:
★★★★★ r
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Google Trends

Scale is based on the average worldwide traffic of tableau in all years. Click on graph for more.
tableau
qlikview
spotfire