BILLmanager is described as 'Automates hosting & cloud sales, billing (pay-as-you-go, prepaid/postpaid), and client self-service. Includes BI dashboards, 30+ payment gateways, multi-branding, and API-first integration with virtualization platforms, registrars, and SSL authorities' and is a popular Billing System in the business & commerce category. There are more than 50 alternatives to BILLmanager, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and iPhone apps. The best BILLmanager alternative is Summit Finance, which is both free and Open Source. Other great sites and apps similar to BILLmanager are Invoice Ninja, Autumn, FreshBooks and WHMCS.