The best replacement for diskeeper is perfectdisk.

The best alternatives to diskeeper are rated as following:
★★★★★  perfectdisk
★★  windows defrag
★★  auslogics
★★  o&o defrag
★★  defraggler
★  defrag
★  smart defrag
★  o&o
★  tuneup utilities
★  o o defrag
★  system mechanic
★  perfectdisk 11
  auslogics disk defrag
  o\u0026o defrag
  ultimate defrag
  o o
  windows 7 defrag
  perfectdisk 2008
  windows defragmenter
  mydefrag
  perfectdisk 10
  ashampoo magic defrag
  perfectdisk 2010
  ultradefrag
  raxco
  speed disk
  defraggle
  perfect disk
  speedisk

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

Other search terms related to diskeeper and their ratings are:
★★★★★ hyperfast
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Google Trends

Scale is based on the average worldwide traffic of diskeeper in all years. Click on graph for more.
diskeeper
perfectdisk
windows defrag