David, can I add also other links?......
Thank you very much for your contribution. I have only included SoundJay because it does not require us to give credits.
Dig.ccmixer (you should remove the www because the link works only without the triple "w"): The website does have some royalty free music but requires multiple clicks to easily see what can be used without credits or not. The website could be more polished and give us a clear look or an easy sortable list. BUT, good source without any doubts.
Bensound requires credits.
As for Pixel stitch, I do see that the tool COULD come in handy but most of the softwares in the list already have similar function and I doubt that a serious designer will use a single function website for their drawings.
As for hosting websites, YoYo Games already provide such services within their marketplace or forums. I still don't mind these links to appear here in the comments but not in the first post as I think this post lives and will continue living as long as we encourage our prefered game creation program and website.
I may add an extra section for credited author assets if more people request or suggest such websites as the assets are INDEED free, but if someone decides or forgets or does NOT read the license or terms of use on the websites by misguard, this can bring problems further down the road for new game creators. But I am not closed to such websites as these authors do merit their credit for their creations and their generosity for their free to use assets.
Because of the way we can sort assets from OpenGameArts, I have added it to the list.
Thanks for your contibution, very appreciated!!!