Hydra

Here's what it actually does: "Hydra is a full-stack billing software that helps businesses save money on implementation and system support while growing revenue, increasing ARPU and keeping hold on subscribers. Multiple marketing-oriented opportunities available including promotions, groups and personal discounts. Rich analytics functions make user base segmentation simple and effective. With Hydra you can offer each group of subscribers an individual pricing plan, create loyalty programs either out of the box or according to your specifications, reducing churn and increasing revenue."