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Simple Invoices - Never Wait For Clients To Pay You Again!
iDempiere - iDempiere Business Suite ERP/CRM/SCM done the community way.
Slimvoice - Insanely simple invoicing
PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.
Zoho Invoice - 100% free online invoicing software for small businesses.
PHC FX - PHC FX is a comprehensive solution that offers a wide range of functionality at any price.