There are a few communities that have a slightly similar spirit in some of the aspects, but I don't know of anything like Newgrounds (except maybe Newgrounds it

There are a few communities that have a slightly similar spirit in some of the aspects, but I don't know of anything like Newgrounds (except maybe Newgrounds itself) soundcloud and codepen.io are the only things I can think of that come even remotely close. Edit: There're pico-8 and https://itch.io/ https://itch.io/ of course, these are coming a lot closer to Newgrounds. Neither have the same target audience as Newgrounds had though