Q:

Where can I get `pngcrush` tool optimizes images for iOS and runnable on Linux server?

iOS uses a variant of PNG processed a tool called pngcrush. If I want to optimized the images on Linux server, how can I do it?

A:

Ignore it, iOS-specific changes don't improve performance. Use regular pngcrush or PNGOUT, AdvPNG.
Although ImageOptim (linked above) doesn't work on Linux, there's a very similar script for Linux.

