OBM is enterprise-class messaging and collaboration platform for workgroup or enterprises with many thousands users. OBM includes Groupware, messaging server, CRM, LDAP, Windows Domain, smartphone and PDA synchronization…
OBM is licensed under the GNU General Public Licens
I also came across the site for the Open Source Magento eCommerce solution. The feature set looks impressive.
I came across Alexander Ananiev's MyArch Solutions tonight - I like a lot of what he has written about SOA and ESBs.