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Sonic Pi is a code based synthesizer, but it's pretty user friendly
Puredata is the free, open source version of MAX, and has a lot of audio synthesis and manipulation capability.
MAX costs a lot of money, but I can dream, can't I?
Crazy virtual modular synth.
Pretty powerful but free music production site
blender is a powerful video/3D/animation platform.
Probably the best free sheetmusic publishing platform.
Another very powerful tool that is a bit of money to subscribe to
A social network to share your creativity.