The best replacement for com is org.

The best alternatives to com are rated as following:
★★★★★  org
★★★★★  net
★★★★  dcom
★★★  co
★★  dll
★★  corba
★★  com+
★★  exe
★  .net
★  activex
★  co.uk
★  net domain
★  ca
★  com au
★  net domains
★  co uk
★  .tv
★  ole
  lpt
  hotmail.co.uk
  www
  comcast.net
  .org
  .ca
  .org domain names
  hotmail.ca
  dot org
  info
  amazon.ca
  gov
  dot net

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

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



Google Trends

Scale is based on the average worldwide traffic of com in all years. Click on graph for more.
com
org
net