Canon i9900 and Olympus Stylus 800.
olympusamerica.com has OLYMPUS Master 1.42EX for MacOS OS X 10.2 or later, updated: May.23 2006.
There is a good chance that Mac OS X printing and iPhoto will support your equipment with the built-in drivers, so you wouldn't have to install any new drivers. But you could download and install them anyway so that you have the latest versions from the original manufacturers.