You can use Save for Web option to save PNGs, or use the built-in batch script to batch slice & export PNGs. It's a very ordinary feature of Photoshop. If you are seeking for, however, a more professional PNG asset generator/software, have a look at Slicy: http://www.macrabbit.com/slicy/, it is a standalone Mac app, or you can take a look at PNG Hero: http://www.layerhero.com/pnghero/, PNG Hero is a Photoshop PNG plugin, that slice & export your PSD and then compress image automatically.
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