PUNIG is a GUI for OptiPNG. Compact user interface for OptiPNG. Very few (unknown) bugs as of now. Next version hoping to read MIME types thus avoiding tricky files.

PUNIG Features:
1. Reports input file size and output file size comparison after compression!
2. Totally portable!
3. Watches CPU usage and give total files complete/how many there are total.

The license of this software is Free, you can free download and free use this graphing software.