GifJif - Turn GIFs into masterpieces.
AIVA - The AI composing emotional soundtrack music
Giphy - Search all the gifs and make your own animated gif
WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
GifLab - The easiest way to create GIFs on your iOS device
WolframTones - Listen to what I just found in the WolframTones music universe