Graphic music visualizer without after effects? I would like to make a YouTube video that has a music visualizer on it (like in Monstercat videos), but I don't want to have to pay for After Effects. Is there a free way to do it? I know I can get the trial, but I want to be able to use it more than 30 days from now. Also, I'm using OS X, so whatever it is can't be Windows only.
A free alternative for After Effects is Jashaka. It runs on every plattform and has some decent features. While it wont have the comfort of after effects for creating such an effect its certainly possible.
If you just don't want to spend all that much but still willing to pay a small price you can go for Apple Motion which costs 50$ and is a fairly powerful tool for animation and motion graphics for the price.
https://www.apple.com/final-cut-pro/motion/
Also here a tutorial on how make something react to music in Apple Motion: http://www.larryjordan.biz/motion-5-make-audio-move-video/
I personally have not worked in detail with both software so I can not give you guidance for actually creating the animation, expect for this tutorial.