v2.5 - 27 June 2014 Free Download
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SuperPNG is a free, open source Adobe Photoshop plug-in for using PNG ("ping") files. It has more comprehensive support for the format than Photoshop's included plug-in and provides control over alpha channel handling.

PNG is an open source file format that supports tight lossless compression. It can be read on any platform by most graphics applications and is fully supported by all modern web browsers.

Check out some samples of PNG compression.

SuperPNG fully supports the PNG format. It includes some additional options for saving PNGs:
  • Alpha channel control
  • Variable Compression
  • Smart Quantization
  • ICC profile embedding
  • Meta Data saving

System Requirements
  Photoshop CS3

Source Code