AdvanceCOMP is a collection of recompression utilities for your .ZIP archives, .PNG snapshots, .MNG video clips and .GZ files.

It's mainly intended for recompressing your rom, snapshot and clip collection of emulated games.

The main features are :

• Recompress ZIP, GZ, PNG and MNG files using the Deflate 7-Zip implementation.
• Recompress MNG files using Delta and Move optimization.

Now go to Download.

If you have problems you can Get Support.

AdvanceCOMP has also a SourceForge page (shared with AdvanceMAME) and a FreshMeat page.

Others good PNG optimizers are OptiPNG and pngcrush. If you want to know more about PNG optimization you can check A guide to PNG optimization.