How we can organize using FOSS.
I have used lot of commercial and free software tools for make my works easier. Here I'm going to point out some of FOSS tools which we can use for our daily works.

For plan our projects :
OpenProj tool , which can easily use for project management.
you can download it from http://openproj.org, its a very easy and useful tool for plan our project works.

Office tool kit :
You can find nice free office tool kit in this url http://www.openoffice.org/, it was made by Sun Micro Systems. No need to pay and you can feel the freedom of the FOSS.

Image manipulation tool :
I think you may have experience with this application, because GIMP application is very famous,
http://www.gimp.org

3D Animation tool :
Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.
http://www.blender.org/

Rough note keeping tool :
Visit http://sourceforge.net/projects/globonote, its a simple tool for keep sticky notes.