Let us howl at the moon and make sweet music together. Come with me and all the pack will join in on the hunt.

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Interesting Free Software

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Audio

Audacity: allows for editing and recording sounds.

Fruity Loops Demo: allows for the creation of professional sounding music and sound effects. The Demo version allows for export to .wav and .mp3 but doesn't allow to save for later editing.

HammerHead Rhythm Station: allows for the creation of quick loops and beats with little effort.

SFXR: allows one to quickly generate sound effects for games with little effort.

Image

Gimp2 Image Editing Software that has been compared with Photoshop.

Irfanview Image Viewer/Editor for a wide assortment of applications. Screen capture, image manipulation like resize etc.

Sketchup For creating 3d objects, but can also help generate 2d images of the 3d objects from within the program itself.

Synfig tool for producing feature-film quality animation with fewer people and resources.

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Interesting Online

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Websites
8bitcollective is the first completely open chiptune-related media repository and file sharing community.

Online character generator.

[] Turn Based Tactics: Part 1 from yoyogames forum which describes the methodology of creating a turn based tactical games battle movement system.