Pdf-splitter is a project mainly written in OBJECTIVE-C and C++, it's free.
command line splitting of pdfs using os x native libraries (read: an excuse to learn objc)
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pdf-splitter will split your pdf files and output page images using native cocoa libraries for speed and memory management.
USAGE: pdf-splitter ORIGINAL_FILE OUTPUT_DIR WIDTH FORMAT
options: ORIGINAL_FILE: the pdf you want to split OUTPUT: the output path where you want to place the pdf images. It should be a c format string like '%d.png'. The extension specifies the resulting image's type. Consult the man page for allowed types. WIDTH: the width of the resulting image
INSTALL in your pdf-splitter directory: sudo xcodebuild clean install