A LayerVaultosok csináltak egy nyílt forráskódú PSD parsert Rubyban:

PSDs are very widely used, yet Adobe has never produced an easy way for developers to work with the format. Indeed, some developers have gone mad trying to parse PSDs. We know the feeling.

For some time, we’ve been meticulously building a tool to open the Photoshop format. It’s a Ruby library for reading and writing PSDs, and it’s called PSD.rb.

/via @hipra