I am going to try and maintain this page as a list of resources and assets that are freely available and are licensed for use without purchase. In other words, they are either released with one of the Creative Commons licenses, a GNU General Public License, or are part of the public domain.
Audio
ClassicalCat-a source for public domain classical music
Creative Commons Audio blog-just what it says, the blog for Creative Commons audio
CCmixter-a site hosting audio shared under cc licences for remix
jamendo-a site with music released under cc licences
Musopen-a site with recordings of public domain music
Free Music Archive- a free music archive organized by WFMU, a radio station in New Jersey
Image search
creative commons image search in google
flickr creative commons search
Fonts
Font Squirrel - a collection of free for commercial use fonts
Miso - a free font
fontforge - font editor/creator
Open Source Production Software
digital photography
Gimp - GNU Image Manipulation Program, "photoshop equivalent"
darktable - "a virtual lighttable and darkroom for photographers"
Raw Therapee - a RAW converter and digital photo processing software
digital painting
Mypaint - fast digital painting program
3d animation
Blender - the leading open source 3d animation package
2d animation
Inkscape - An Open Source vector graphics editor
Pencil - bitmap and vector animation software
Synfig - vector based 2d animation software
writing
Celtx - pre-production software, integrates scriptwriting and scheduling
Open Office - office suite
audio
Audacity - audio recording and editing software
Ardour - digital audio workstation
Hydrogen - drum machine
video editing
Pitivi - Linux video editor
