Plastaq Software Scythe
Platform/format: PC, Mac/VST Download
It's slightly unusual to see an iPad app being brought to the desktop, but that's pretty much what's happened here. Scythe is a synth that borrows its engine and interface from GrainBender. Its oscillators sport analogue and digital waveforms, while there are also modulation options and effects.
Platform/format: Mac/AU Download
This 'audio-controlled synth' (though strictly speaking it's an effect) is now free. The plug-in is based on a multi-waveform oscillator with up to six voices, with the parameters being modulated with the input signal's dynamics. There are effects, too, the end result being a device that can help you to produce all kinds of glitches and noises.
Platform/format: PC/VST Download
Give your music a bit of crackle with this vinyl record player emulation. You can adjust the dust count, colour and level, set how much you want to 'age' the recording and dial in a bit of gentle distortion.