RESOURCE LIST

Plugins

http://mvplugins.com/master-list -- If it's not here, it probably doesn't exist.

http://yanfly.moe/ -- Yanfly is wonderful. Great technical plugins, and they're very easy to use.

http://himeworks.com/ -- I love hime's plugins - I always seem to find just the one I needed. Great for those miscellaneous things that just make everything work better.

https://atelierrgss.wordpress.com/ -- Mog's plugins are flashy goodness. I'd say these are the most creative (and recreative:P) I've seen overall.

Obviously there are many more people making plugins. Great ones at that:D
But these are usually my go-to when looking for cool things.



Audio

https://www.jewelbeat.com/ -- These cost money, but you can get some pretty good deals (still expensive though, rawr.)
I like them. They have decent to great music. I've yet to have problems with them.


https://www.audioblocks.com/ -- Decent to great music. I've had issues with them in terms of video strikes, but they have a huge selection.

You can also google "free rpg maker music" and find things.
Newgrounds is also a great site, if you're not going commercial.



https://www.sounddogs.com/ -- Has lots of free to use sound effects.

http://soundbible.com/ -- Same^

Graphics

i usually make my own graphics, but just googling "rpg maker whatever you're looking for" will help. Even if you're making your own, it's a great help for references.

https://www.videoblocks.com/ -- Costs money, but it's great for video effects.

Game Makers