fatfreecrm sugarcrm vtiger Of the three, my preference is fatfreecrm - light weight, well written, ROR based. Sugar might have richer capabilities if you need

fatfreecrm sugarcrm vtiger Of the three, my preference is fatfreecrm - light weight, well written, ROR based. Sugar might have richer capabilities if you need it. All of the above are open source, or have open source versions.