★★★★★
Zebralette is another example of a free version of a paid product. But the free version here is an incredible sounding synth in its own right. However, it features just one oscillator.
One oscillator may not seem like enough for a synthesizer, but Zebra2 oscillators are rather powerful and clever.
It resembles many other oscillators you may have used. You can choose your own waveset from the included library, or just use the waveform editor to easily draw and sculpt your own shapes (see above).
The Waveform Editor manages up to 16 different waves and lets you rearrange, duplicate and morph between individual waves.