Alchemy Eye network monitor
The Alchemy Eye network monitor is a free and open-source Windows application that continuously collects data to test the availability, performance and reliability of all devices connected to your network. The program can be installed and started in less than 5 minutes, then left running in the background so it will automatically send periodic updates to an on-screen graph.
The most recent release of Alchemy Eye contains improvements in stability, usability, security and performance. It also features a new ‘Move Window’ feature which makes it easier to position the program window on screen.