The best replacement for iwork is office.

The best alternatives to iwork are rated as following:
★★★★★  office
★★★  microsoft office
★★★  office for mac
★★  microsoft office for mac
★  office 2011
★  ms office
★  openoffice
★  microsoft word
★  word
★  google docs
★  office 2008
★  quickoffice
★  libreoffice
★  office for mac 2011
  microsoft office 2011
  office 2013
  microsoft office for ipad
  documents to go
  mac office
  office for ipad
  microsoft office 2008
  appleworks
  microsoft office for mac 2011
  office mac
  ilife
  iwork family pack
  neooffice
  quickoffice pro
  iwork family
  word for mac
  open office
  ms office for mac
  quickoffice pro hd
  office 2004
  idisk
  microsoft 2011

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

Other search terms related to iwork and their ratings are:
★★★★★ pages
You have in mind a companion for iwork and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of iwork in all years. Click on graph for more.
iwork
office
microsoft office