Your service operation isn’t one-size-fits all, so your IT service management solution shouldn’t be either
The Vivantio Platform allows you to focus on the IT service management tools that make sense for your organization’s unique service model: from incident, problem and change requests, to service requests, client knowledge and asset management
This is a Windows Mobile software that monitors SIMcard, GPS position, and auto answer to SMS.
It's small (build in C++), doesn't have any dependency, and still provides all the features found in commercial applications.
It consumes no memory.