PiCon is a Raspberry Pi configuration manager which lets you make changes to the config.txt file using a GUI. The config.txt file is used to store various system parameters that you would normally set from the BIOS, but Raspberry Pi doesn’t have a conventional BIOS and thus, it uses this file for such settings.
The application is designed to run on a host system (works on Windows, Linux and Mac since it’s written in Java) and not directly on the Raspberry Pi. It is possible to run the app on Raspberry Pi, but the performance is pretty bad.
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Raspberry Pi Configuration Manager `PiCon` Lets You Configure Your Pi Using A GUI (WebUpd8)