You may find a list of a lot of other alternatives on sourceforge
http://sourceforge.net/directory/?q=erp
Sourceforge provide an infomation on "Enterprise" ready solutions. Number of download is also a good indicator of popylarity of solution.
You may find the Dolibarr ERP - CRM ( http://www.dolibarr.org/ ), or OpenBravo are also a very good choice if you are looking for an easy to use software.
Slashdot Mirror
You may find a list of a lot of other alternatives on sourceforge http://sourceforge.net/directory/?q=erp Sourceforge provide an infomation on "Enterprise" ready solutions. Number of download is also a good indicator of popylarity of solution. You may find the Dolibarr ERP - CRM ( http://www.dolibarr.org/ ), or OpenBravo are also a very good choice if you are looking for an easy to use software.