Testchkr is a free uptime tool for all types of test systems -- Dev test, QA/QC/Qualification/PreRelease/PreProduction test systems, or Certification systems. It checks the networked elements of one or more such systems continually and alerts you immediately when any element goes offline. Save test time, avoid time lost in retesting, and meet tight release schedules. Quick, easy installation and setup, and maintenance-free operation. Alert by email and/or text message. Advanced version available for advanced needs. Runs on any Windows or Linux machine, and tests systems running under any OS. Free forever for 10 targets, with economical subscription licenses for larger numbers.