CRM

Ressources

http://www.java-source.net/open-source/erp-crm (Java)
http://swik.net/CRM+PHP

http://www.insidecrm.com/features/top-open-source-solutions-121307
http://www.elitecrmsoftware.com/open_source_crm.html
http://www.smallbizcrm.com/free-single-user-crm.html, http://www.smallbizcrm.com/free-single-user-crm.html

Discussions

http://www.cio.com.au/article/333705/5_open_source_crm_systems_watch
http://mashable.com/2010/05/21/social-crm
http://www.sitepoint.com/top-5-crm-tools-freelancers-small-businesses
http://www.sitepoint.com/7-crm-options-compatible-drupal