Keygen - A dead-simple software licensing API built for developers
WebCops - With more than 30 years of experience in copy-protection and encryption. Link Data is making protection for CD, DVD, USB and web on Windows, Mac and Linux.
Open iT LicenseAnalyzer - Open iT LicenseAnalyzer is a software usage metering and optimization tool that provides an enterprise-wide overview of installed software programs managed by most software license managers.
LicenseWatch - License Management
Labs64 NetLicensing - Monetize your digital products and services
SLASCONE - SLASCONE is a Licensing as a Service solution for software and IoT vendors. SLASCONE helps vendors distribute, protect and monitor their products, with minimal engineering effort. In the cloud.