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    Integrated telecom billing, BSS OSS, and convergent charging

  3. You're just 5 minutes away from accepting recurring payments and one-time payments online. Explore for Free. No credit card required.

  4. Xero is online accounting for your small business.

  5. Chargify is the best online billing software for all of your Recurring Billing needs. Learn more about simplifying your Subscription Billing today.

  6. Free and open source invoicing application to host on your own server.

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  8. Invoiceraâ„¢: World's most powerful online invoicing & billing software trusted by millions of users globally.