LÖVE

Book about procedual content generation:

http://pcgbook.com

Very interesting (but maybe not that relevant for 2d development) talk by John Carmack:

http://www.youtube.com/watch?v=MG4QuTe8aUw

I added http://concernedjoe.com/devblog/hardcoding-slopes/ to the wiki page. It shows a tidy way to handle slopes and curves in a tile-based game.

Freesfx.co.uk has some great sounds and music (Needs registration)

Just happened across this cool 3D Modelling/Animation software that uses Lua scripts to make animations and stuff.
http://bp.io/fugu/old/index.html

Xelu had a presentation on how he implemented death animations. He uploaded it here:

Game feel | Why your death animation sucks

Do you happen to have any composition or harmony tutorial?

A new project that's well underway at the moment with some free stuff, I don't know weather the list has to be for exclusively free site or not.

http://www.gamedeveloperstudio.com

I have something that might be useful for most people creating tile based games.
The tiles are 11 x 11 pixels each. All of the tiles are separated by a colored pixel to prevent myself from overwriting other tiles and to keep things organized and also, these tiles are in grey-scale so they can be colored.

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Candy Land Tileset v1.1 (8x8)
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A tileset created by myself. Feel free to use it for whatever you want.
(also I may update this post with newer versions of the tileset)

License:

This work is licensed under a Creative Commons Attribution 4.0 International License.

Preview:



Tileset (40+ tiles):

I found an amazing artist with >100 excellent JRPG-ish songs of all moods and types. Really, check them out. https://soundcloud.com/sei_peridot/sets ... nematerial