There's xpdf which includes the
Pdftotext converts Portable Document Format (PDF) files to plain text.
On Linux there's a installer available. It seems that it also comes in the
poppler-utils package. On OS X you could install it using Homebrew (install that first) and then use
brew install xpdf
which will download the source files and compile it for OS X. After that, just use it like:
which will generate a plain text file. There are a couple of options as well, check out
man pdftotext for more details.
An alternative is poppler, in OSX:
brew install poppler
in Debian and friends
apt-get install poppler-utils