This is an obsolete content ! please visit my Ifremer page for last update
Most of my codes are now available on the Google Code website. A simple way to download the codes is with the svn system. SVN is, as Wikipedia puts it:
Subversion (SVN) is a version control system initiated in 2000 by CollabNet Inc. It is used to maintain current and historical versions of files such as source code, web pages, and documentation. Its goal is to be a mostly-compatible successor to the widely used Concurrent Versions System (CVS).
A manual is available online here: http://svnbook.red-bean.com/en/1.5/
So, basically, you just need a SVN client to download a code. There's a bunch over there: http://subversion.tigris.org/links.html#clients
For Mac I use svnX. But this is just a GUI, so you need a working install of Subversion. Check here for a nice and easy way to install Mac package.
To conclude, go to the svn repository, find something you may want to look at (a directory) and then checkout with:
svn checkout http://guillaumemaze.googlecode.com/svn/trunk/[WHAT-YOU-WANT-HERE] [HOW-YOU-WANT-TO-CALL-ON-YOUR-DISK]