It's very informative and useful open source invoice have tools. I have checked all software you mentioned here. Apart from your open source invoice tools, we have best invoicing tools for businesses. You can also refer at http://www.softwaresuggest.com/billing-invoicing-software
SugarCRM and Vtiger are very popular CRM tools, but I have other list of best CRM tools for business. You should also check this software before choosing right software for your organization. http://www.softwaresuggest.com/crm-software
It's very informative and useful open source invoice have tools. I have checked all software you mentioned here. Apart from your open source invoice tools, we have best invoicing tools for businesses. You can also refer at http://www.softwaresuggest.com/billing-invoicing-software