Open-source or open-licensed software is great, and we use it whenever we can! Here's where you'll find it: jsCalendar is used for date selection, and Libchart and PHPlot are used in generating charts. All are used under the terms of the GNU Lesser General Public License. Our drop-down menu is based on the LWIS CSS drop-down menu framework and is used under the terms of the GNU General Public License. The fancy zoom-in on charts is done with Paul Engel's elegant Top Up, generously available under the Creative Commons Attribution-ShareAlike 3.0 license.
Front page images like the one above by Nic's events are submitted by our members or taken from Flickr (search word: "wonderful"). We use them under the Attribution-ShareAlike 2.0 CC License. The images of Alice and Partario come from Mahalie's and Chema.Foces's Flickr photostreams and we use them under that license too.
Most smaller icons used in Project Wonderful are based on "Silk" by Mark James, and are used under a Creative Commons Attribution 2.5 License. The exception are the national flag icons, which are provided by Icon Drawer. Larger icons used under the GPL include beautiful work by Everaldo Coelho, Sergio Sanchez Lopez, Lothar Grimme, Alexandre Moore, Gnome Art, Alessandro Rei, and Oxygen Team. Talented artists asking only for a link (if that) in exchange for their icons include Icons-Land, WDD, Pixel Mixer, BAM, S. Shek, WebIconSet, Ozturk, Abdylas Tynyshov, Gasyoun, MazeNL77, and Harwen Zhang. Creative Commons licenses give us icons by Jakub Stacho, Icon Shock, IconFinder (who also have a terrific icon search engine), VistaICO.com, Shlyapnikova, Paul Robert Lloyd, PCconsultants.co.uk, The Noun Project, and Visual Pharm. Whew!
Our HST/GST number is 818 581 357 RT0001.