ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
mixmello - mixmello is a free, open source tool to create remixed versions of your favourite playlists.
cassini - Polyphonic Synthesizer for iPhone/iPod touch
remixmonsta - Tired of Despacito? Find a cool remix instead
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
The Rick Astley Remixer - Remix your favourite songs in your browser.