Keygen - A dead-simple software licensing API built for developers
SnowSoftware - Snow Software are suppliers of Software Asset Management products and help optimizing licensing & minimizing compliance risk.
Labs64 NetLicensing - Monetize your digital products and services
Torii - SaaS Management Software.
LicenseSpring - Reliable and easy to use License-As-A-Service (LaaS) for for any software application
SoftwareKey Licensing System - SoftwareKey System is a set of software development tools that help programmers implement copy protection, license activation and management, metering, eCommerce, and business automation.