SDF Public Access UNIX System : The Super Dimension Fortress is a networked community of free software authors, teachers, librarians, students, researchers, hobbyists, computer enthu...
SumoPaint : Powerful graphics editor for your web browser and pc
Freesound : Freesound is a collaborative database of Creative Commons Licensed sounds. Browse, download and share sounds.
Silk Icons : “Silk” is a smooth, free icon set, containing over 700 16-by-16 pixel icons in strokably-soft PNG format.
System UIcons : A free icon set designed for systems and products. Use how you want, without attribution.