April 18, 2007 -- -- Software-as-a-service platform developer OpSource (opsource.net) announced on Tuesday the general availability of OpSource Billing, the latest in a series of business services available to SaaS and Web 2.0 companies that use the OpSource On-Demand 2.0 application delivery platform.

OpSource Billing, based on technology from Aria Systems, is a complete, end-to-end payment and collections processing solution that is designed to support the business needs of on-demand companies. It