CAcert is a non-profit volunteer organisation which provides SSL and S/MIME digital certificates for free.
Try the Firefox web browser. It's fun, it's fast, it's free! You can't lose! Handy features include: popup blocking, tabbed browsing, nifty search tools and superior privacy.
Libre Office is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute.
Linux Australia is the peak body for Open Source communities in Australia. Linux Australia represents approximately 5000 Australian users and developers of Free Software and Open Technologies, and facilitates internationally-renowned events including linux.conf.au -- Australasia's grassroots Free and Open Source Software Conference.
Ourobengr - A Brief Study in Software Engineering examines the cycles through which engineers personally progress when developing software, from cautious optimism, to annoyance, to shock, to horror and (hopefully) back again.