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FOSSBilling is a free open source, billing and client management solution. Whatever the size of your online services business, whether a startup or established, fossbilling can help you to automate your invoicing, incoming payments, and client management and communication.
If you run a web hosting business and are looking for an open-source alternative for billing and client management, then fossbilling is the answer. Although it is mostly used as a solution for hosting businesses, there is no reason why you can't use fossbilling for any other kind of online business, like digital downloads.