strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Labs64 NetLicensing - Monetize your digital products and services
ftrace - A function tracer for the Linux kernel.
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.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.
LicenseSpring - Reliable and easy to use License-As-A-Service (LaaS) for for any software application