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Open-source alternative to Stripe Billing and Chargebee it offers a modular architecture for metering and usage-based billing, at every stage of your company.
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Bigcapital is financial accounting with intelligent reporting for faster decision-making, an open-source alternative to Quickbooks, Xero, etc.
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Invoice Ninja is the leading free, open-source online invoicing app for freelancers and businesses.
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Start Accepting Bitcoin Payments With 0% Fees & No Third-party