Keygen - A dead-simple software licensing API built for developers
Labs64 NetLicensing - Monetize your digital products and services
Sewport - Connecting brands with clothing manufacturers
VMProtect - VMProtect Ultimate - All-In-One Solution For Software Licensing And Protection.
Keydock - Painless license key generation for products you develop.
LockBytes - LockBytes is a Lightweight DRM (Digital Rights Management) solution for licencing Windows executable files.