Roundup of Free resources for 2d games

Extra (Edit): After going through lots of free resources, I've created the SpriteWorld web page. It's a collection of some the many free resources I've found.
Feel free to browse through and don't forget to +1 if you like it.

Although Sprite Would has a lot of content, I still recommend you read thought this post.

Another highly recommended reading for developers is this awesome post.

--- Original Post below ---

 Metal Slug cloning

http://teh_pro.webs.com/sprites.htm

- Some nice Metal Slug-like character animations. 

 Lost Garden 

.. a great site with lots of links to free stuff, more below:

http://www.lostgarden.com/2007/05/dancs-miraculously-flexible-game.html

- Really nice looking :-)

License: CC like (http://lostgarden.com/2007/03/lost-garden-license.html)

Small World (Lost Gardens)

• SmallWorld Graphics.zip
• Lost Garden License: Read here for licensing details

Zelda like (Lost Gardens)

http://www.lostgarden.com/2006/07/more-free-game-graphics.html\

 hasgraphics.com 

contains a very nice list of free sprites:

Disclaimer from hasgraphics.com:

All the sprites found on this site are free to use for commercial and non-commercial projects. All the sprites are the property of their respective authors and Has Graphics only features them. We carefully inspect all the sprites we publish to make sure they fit certain quality criteria, and most important that they are available for non-commercial and commercial game projects.

GamePoetry RPG Sprites and Tilesheets

Shadow Character Running and Jumping

Walking/Jumping Robot for Isometric and Platform Games

8-bit Sinistar clone graphics

Remastered Tyrian Graphics

Hard Vacuum Tileset and Sprites

DanC Planet Cute Tileset

Gfx-Lib Fuzed(by spicypixel.net)

TomeTik Sprites and Tilesets

Grunge and Industrial User Interface Sprites

 SpriteLib

Also a nice list, although I find the tiles very small.

Common Public License

If you would like to show your appreciation for SpriteLib, please consider making a small donation. 
All donations are handled securely through PayPal and do not require an account.

http://qs.kapouta.com/l

 Mystery Forest Tile Set

See also: http://qs.kapouta.com/k

License: Unkown

  Slope_1.gtx   
  Slope_2.gtx  

 GfxLib-Fuzed – Royalty Free Game Graphics

GfxLib-Fuzed is a package of free art assets which can be used by game developers, hobbyists and enthusiasts for their own projects. It is available under terms of the Common Public License .

 http://opengameart.org/

This website is great and has so much quality tiles that I recommend you to have a look by yourself.

Collected Art: 

Pixel Art Tiles from Last Escape

Side-Scrolling Fantasy Themed Game Assets

Oriental Roof Tiles

Old Frogatto tile art - 2

Pixel ground tiles

Mystery Forest Tile Set

old frogatto tile art

Generic Platformer Tiles

Sci-Fi Scidescroller Tiles

Classical Ruin Tiles

Cute platformer tiles

jungle-themed platformer textures

Game PlateForme Sprite

Platformer level design

SuperTux tiles

Platformer bricks tileset

Monorail side-view tileset

Tileset and assets for a Scorched Earth type game

Lazy Brain Sprites

Platform game sprites

Communication terminal, 32x32

Breakout graphics (no shadow)

Breadinator's General Purpose Top-down/Platformer Tileset

Gnarled Tree

Cryogenic Beds

Vectowers/Vecturrets: Rockets and Laser Beam

Monsterboy in Wonder World mockup assets

141 Military Icons Set

Pencil Drawn Platformer

Platformer: pieces

mangrove

explosion animations

Turrets for Ten Floors Down

Several scrolling backgrounds and layerable "runners"

castle platformer

Man

Haunted Forest Trees

Misc. Dark Fantasy Scenery Sprites

Lemcraft

Turfwars - Pixel City Tile Set

Bubble Tile Char and Tiles

Knight Woman 16px Dungeon Platformer

Rotating Crystal Animation (8-Step)

Surt's killer Platformer tiles and critters

Green platformer floor & support tiles.

pipe tiles

1950's Scifi setting indoor tileset with kitchen appliances.

Gold box/bricks and grass.

Industrial TilePack

Updated Generic Platformer Tiles

Grass Bar

8-bit city tile set

 DeviantArt

http://qs.kapouta.com/m , http://qs.kapouta.com/n

Note: Overall the website seems to have a lot of contents, however after a brief search I found very little  free CC content. The stars rating is reflecting my opinion as a website for free resources for indie games, not as a whole.

Some other findings:

http://indierpgmaker.deviantart.com/

Aparently DeviantArt has lots of isometric view tilesets: http://browse.deviantart.com/digitalart/pixelart/scenes/iso/

other,

http://fav.me/do00wz

 http://www.spriters-resource.com/

I liked the website, however didn't really find easy to use tiles.

 http://spritedatabase.net

The best resources sites I've found so far.

However I'm not sure regarding the usability of the contents... looking briefly to the forum it seems that it's good for play, not good if you want to make money (otherwise I would give it 5 stars):

So basically, you can use sprites as long you never receive a single cent for whatever you do with them. (This includes "voluntary donations" which is a popular excuse used by smug people whi think they can fool the law with semantics.)  (link)

 engine001

http://www.engine001.com/resources/items/firearm.htm

Lots and lots of resources, however files are in a strange format and tilesets seem too simple.

Unrated:

http://www.gsarchives.net/
http://www.bghq.com/
http://acidsound.blogspot.de/2012/02/spritetitle-resources.html
http://www.freewebs.com/dlbrooks33/dlbrooks33.htm

Forums:
http://www.sprites-inc.co.uk/forum/ (very promising)

http://www.spriters-resource.com/community/

http://z15.invisionfree.com/DJ_Universe/index.php?showtopic=2645

Extras:

Here are some sound and music links:

• Midi World

• Australian Creative Resources

• Partners in Rhyme

• Midi Files

• Midi Database

• Midi Arena

• Free Loops

• Freeplay Music

• FlashKit sound effects

• FlashKit loops

• Music Robot

• Video Game Music Archive

http://www.wildbunny.co.uk/blog/2011/12/11/how-to-make-a-2d-platform-game-part-1/

Sound effects asset resources

Page name/link	File formats		Details	Active	User can contribute	Licenses
Freepats	.pat		Instrument patches for software synthesizers	Yes	Yes	CC0, GFDL, GPL, LGPL
Freesound	.wav, .aif, .flac, .ogg		Community-based sound library	Yes	Yes	CC0, CC-BYv3
Obiwannabe sounds andgenerators	.mp3, .pd		Various game dev sounds including procedural generators for such	No	No	CC-BYv3, GPL[4]
OLPC Sound Samples	.wav		Instrument and music samples, sound effects	Yes	No	CC-BYv3
OpenGameArt sounds	flac, mp3, ogg, wav		User-submitted repository of game sounds	Yes	Yes	CC0, CC-BYv3, CC-BY-SAv3, GPLv2, GPLv3
public domain sounds	.flac, .ogg		Sounds mostly in mp3 format	Yes	Yes	CC0

https://love2d.org/wiki/Free_Game_Resources

• bfxr
 is an online sound generator.

• Independent Ljudbank
 (Swedish)

• Freesound
 (Requires registration for downloads, but otherwise bullshit-free)

• PDSounds
 (might be down, check out this in that case)

• Soundsnap
 (make sure you learn the license, it is not exactly CC)

• Media College's sound effects

• Newground's audio
 contains free songs and loops.

• http://www.artistx.org/site2/media/free-resources/free-music.html
 another listing-type page. Licenses vary.

Music:

• Jamendo's free music
 (Various)

• Musopen

• Binärpilot
 (Evil chiptunes. Big plus for umlaut. Licensed CC-NC-ND. Use with caution.)

• 8bitcollective
 (Chiptunes) (Licensed CC-NC-SA. Use with caution.)

• Fanatical Productions

• Creative Commons' own list of music, containing lots of links. Two examples below:

• ccmixter
 is a "a community music site featuring remixes licensed under Creative Commons where you can listen to, sample, mash-up, or interact with music in whatever way you want."

• sampleswap
 is a "100% free AIFF/WAV collection contains 6.4 GB of sounds"

Also, let me know if you know a good site for me to add.

Keywords:

128x128, 16x16, 2d, 32x32, 64x64, 8 way, character, game, isometric, MM7, platform, platformer, RPG, sprite sheet, sprites, tileset, 32 bit