The best replacement for openerp is openbravo.

The best alternatives to openerp are rated as following:
★★★★★  openbravo
★★★  tryton
★★★  ofbiz
★★  sugarcrm
★★  adempiere
★★  postbooks
★★  erpnext
★★  opentaps
★★  vtiger
★  frontaccounting
★  xtuple
★  weberp
★  microsoft dynamics
  netsuite
  tally

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

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



Google Trends

Scale is based on the average worldwide traffic of openerp in all years. Click on graph for more.
openerp
openbravo
tryton