Free Game Development Resources Link Mega-thread
Armelline
Member, PRO Posts: 5,397
Here is a list of links to useful sites I've encountered while working with GameSalad. With the exception of the GameSalad Apps section, everything here is free - be it public domain or attribution licensed. I've included paid apps in the apps section as there aren't that many GS apps and it seemed silly to miss them off this list.
At the end of each item is a brief summary of the restrictions placed on it. Please do take the time to check yourself what the restrictions are on an item before using it - but anything more than attribution and I've left it off the list, as a rule.
Don't read anything into any ordering, it's pretty much at random. Please let me know ASAP if you have a link to a helpful thread or site you want added to the list! I've not intentionally left anyone off. I'll keep adding things until I lose the ability to edit the post. I particularly want to get a comprehensive section for video tutorials put together.
Art:
Super Pixel Time - Turn any image into pixel art [No restrictions]
Lost & Taken - Free textures [Optional Donation]
Subtle Patterns - Subtle patterns and textures [Attribution]
Adobe Kuler Colour wheel, good for finding complimentary colours [No restrictions]
Kevin MacLeod Music Free music of various genres [Attribution]
Open Game Art - Wide selection of different types of game art [See individual files]
noupe 80 Photoshop Brushes - A selection of varied Photoshop brushes [See individual brushes]
Outsourcing Advice - Advice regarding outsourcing artwork [Free]
30 Pixel Art Tutorials - Pixel art tutorials [Free]
ColourCombos - Color combinations and color schemes [Free]
Free Stock Textures - Free textures and patterns [No restrictions]
Open Clipart - Completely free clipart and images [No restrictions]
Testico - Compare your icon to other icons! [Free]
Sound:
Sound Image - Free music and soundscapes [Attribution]
FreeSound - Sounds and sound FXs [Creative Commons - many restriction free]
Musopen - Public domain classical music [No restrictions]
Incompetech - Royalty-free music [Attribution]
DeepBlueApps Free Music Pack - A selection of free tracks [No restrictions]
Open Game Art - Mainly art, but also includes music and Sound FX [See individual files]
Bfxr - Create custom 8-bit sound FX [No restrictions]
as3sfxr - Create custom 8-bit sound FX [No restrictions]
Fonts
DaFont - Wide selection of free fonts [See individual font]
Font Squirrel - Selection of quality fonts free for commercial use [No restrictions]
40 Free Fonts for Minimal Web Design - Clean, subtle fonts [See individual font]
Noteworthy threads
Spare Code Thread - Snippets and demos from many members of the community [See individual posts]
Armelline’s Free Stuff For Everyone - Free demos, templates and experiments [No restrictions (some on art used)]
Community Tutorials by Braydon_SFX - Free templates and tutorials, including video tutorials [No restrictions (may be some on art used)]
Sending and Receiving Data Using Your Own SQL Server - Set up your own server to leverage GameSalad's network behaviours [Free]
A lot of FREE templates by GSInvention - A selection of free templates [No restrictions (may be some on art used)]
Stormy’s GS TAble-izer - Preview your tables while testing your games [Free]
FREE Games, Templates, Tools from DBA - Free templates and tools [No restrictions (may be some on art used)]
Marketing
prMac - Distribute press releases [Free and paid tiers]
The Holy Grail List of App Review Sites - List of review sites to promote your game to [May vary per site]
11 Places To Publicize Your iPhone App - A list of iPhone sites to publicise your game to (getting out of date) [May vary per site]
GameSalad apps
GameSalad Custom Scene Editor - Precision tools for laying out your scenes](OS X) [$50]
SaveSalad - Auto-saver for GameSalad](OS X)
GS Project Merger - Merge multiple projects together (OS X) [£10]
GS PC to Mac - Convert PC GS files to Mac GS files (OS X) [Free]
GS Pre-Loader - Set pre-loading of art to on/off, project-wide (OS X) [Free]
GS Project Optimiser - Optimise your project with a selection of tools (OS X) [£10]
GS Project Attributes - Easily alter and adjust game attributes (OS X) [£6]
GS Scene Merger - Quickly merge multiple scenes together (OS X) [£10]
GS Quick Resizer - Resize your project to any target device (OS X) [Free]
GS Breakout Builder - Easily generate complex breakout style scene layouts (OS X) [Free]
GS Picture Wave - Create a wave effect from your chosen picture (OS X) [£3]
GameSalad Related
AppFormative - Analytics for your GameSalad game [Free]
Windows 8 Publishing Guide - Testing and publishing your GameSalad games/apps to Windows 8 [Free]
GameSalad Templates
DeepBlueApps - Free and paid templates [See individual templates]
GS Helper - Free and paid templates [See individual templates]
GS Invention - Free and paid templates [See individual templates]
Stormy Studio - Free and paid templates [See individual templates]
Mantu Apps - A few free templates [See individual templates]
Mostly Creative - Free templates and educational resources [See individual items]
Comments
Like it. Honestly, it's much better than the previous thread we had like this -- it was not organized as well. Thanks for putting this together and thanks for the link to my demo thread.
Thanks
I'd really love to make it a constantly updated and ever-expanding thread, but only so much can be done in 24 hours 
What a great list @Armelline Thanks for taking thime to put it all together for us all
@Armelline, fantastic! Invaluable!
Maybe consider
http://testico.net/
for the list. It is a great way to see how your app icon stands out next to the competition.
Added!
Time is running out to get your link added!
this is a nice list you have here, thanks!
Hope it's not too late. Maybe you could add: http://TheDeveloperDepot.com/? Site just got launched so only has one free template but will have a lot of content soon.
Also, this is the thread where we announce the free content.
http://forums.gamesalad.com/discussion/71584/awesome-free-templates-from-the-developer-depot#latest
Thanks!
Great list, btw. Love how orginized it is.
Woohoo! this is really awesome @Armelline!
Thanks guys. Sorry PureEpicStudios, can't edit the thread now
But to be honest I'd probably not include your link just yet - I had a requirement of templates, so you'd need at least two 
Awesome Job , Thanks for the links!
Thanks for the list and mentioning us
Add this thread to noteworthy threads
I found this hanging in my hard drive, an AppleScript application I coded some time ago. It converts text to a transparent png image. You can customise size, font (installed on you Mac font book) and colour. Hope you like:
https://dl.dropboxusercontent.com/u/61305568/Text to Image v1.1 by alex constantin.zip
Hey @Armelline,
I was wondering if by chance you had the The Holy Grail List that you could share. Tried getting it but was having issues on my end trying to download in. Thanks in advance!
Sorry, missed your post when you posted it! No, sorry, I didn't make a copy
Perhaps email the author of the article?
Thank You! @Armelline
Thanks!
Also I See your using Wordpress, a great software! If you'd ever like any help (I'm free) don't hesitate to let me know. I'm pretty good at Wordpress and I will be happy to help.
Look at the seller.
If you could, please add my site learngs.com. All content on the site is 100% FREE!!
Templates, Videos, Tutorials, you name it!
Can't edit the first post any more
I'll make an updated list at some point though and be sure to add your site!
.
Did some random thread get merged in here?
Thank you very much for all of the resources. I knew about some of them but most were new to me. Very helpful.
BEST. THREAD. EVER.
Excellent stuff.
Thanks, @Armelline
And a big thanks too for your IAP demo - excellent as well. Solved all my head-scratching!
Can't believe i missed this! Thank you @Armelline
Bookmarked.
Wow...thanks for sharing
Hey you forgot the guru
I think this was posted during your break from GS :P It was back in mid-2014! But I didn't really intend it to be a list of tutorials and videos, more assets and resources of that kind.
Whaoo great list! everything is here..Thank you very much.