The best replacement for keynote is powerpoint.

The best alternatives to keynote are rated as following:
★★★★★  powerpoint
★★  powerpoint 2011
★★  powerpoint 2013
★★  prezi
★★  pages
★  powerpoint 2010
★  gomez
★  plenary
★  key note
★  slideshark
★  powerpoint 2012
★  beamer
★  documents to go
★  pages which is better
★  keynote
★  tonic
  new relic
  powerpoint 2007
  ppt
  quickoffice hd
  powerpoint for mac
  haiku deck
  360
  powerpoint 2008
  slide shark
  mintel
  powerpoint mac
  powerpoint better
  power point

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

Other search terms related to keynote and their ratings are:
★★★★★ propresenter
★★★ iphone remote
★★★ apple remote
★ keynote
ipad keynote
You have in mind a companion for keynote and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of keynote in all years. Click on graph for more.
keynote
powerpoint
powerpoint 2011