GrandPerspective is a utility application for macOS that graphically displays the disk usage of your file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space.
The NAGIOS network monitoring system is well known in the community. It can be used to monitor network services. The goal of this project is to develop an application that implements an Nagios visualisation application (like NagVis) on the iPhone.