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Billwerkplus
Billwerk+ is a subscription billing platform that automates recurring and one-time billing, pricing plans, dunning, invoicing, and payments—with flexible catalogs, analytics, compliance, and deep API integrations.
Zammad is a customer service software for helpdesks, call centers, and ticketing. It helps you build an efficient helpdesk, manage your customer relationships from start to finish, and turn one-time customers into repeat buyers.