The best replacement for ost is pst.

The best alternatives to ost are rated as following:
★★★★★  pst
★★  vtl
★  pst file
★  soundtrack
★  osv
★  cached mode
★  pst outlook 2013
★  .pst difference
★  pst files
  pst outlook
  planswift
  roma tib

Your alternative for ost is not listed? Suggest!
Speaking about ost, one probably shouldn't forget about love japanese drama.

Other search terms related to ost and their ratings are:
★★★★★ love japanese drama
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Google Trends

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ost
pst
vtl