AdvanceCOMP v1.17 is released. AdvanceCOMP contains recompression utilities for your .zip archives, .png images, .mng video clips and .gz files.

AdvanceCOMP package contains:
advzip - Recompression and test utility for zip files
advpng - Recompression utility for png files
advmng - Recompression utility for mng files
advdef - Recompression utility for deflate streams in .png, .mng and .gz files

AdvanceCOMP v1.17 Changelog:
* Changed to GPL3.
* Added zopfli support. It's enabled using -4, --shrink-insane. You can control the number of iterations with the new -i, --iter option.

Download: AdvanceCOMP v1.17
Source: Here