There are at least few vst instruments, always mentioned all over the world in all kind of “best free vsti” forum threads. Fuzzpilz Oatmeal synth is one of them. It’s a simple two-oscillator subtractive synthesizer – an author even called it mediocre hehe. But it’s far from the truth. Actually, Oatmeal is pretty unique and definitely one of the most versatile and best sounding freeware softsynth available. For example, one of the best features is an ability to draw your own waveform shape and use it in Oscillator !
I agree, default GUI is awful 🙂 but over time, Fuzzpilz Oatmeal grew a lot and now the whole zip package contains a lot of great skins (you can see the example by clicking on thumbnail) and huge amount of soundbanks (40 – 50 ?). It’s quite low CPU intensive so you can easily layer 2-3 instances of it and make some huge sounds.
Very good plug-in (with enourmous presets collection) that in current state could be even a payware – but fortunately it’s not 🙂
Audio Demo: Oat11meal – BrainOvulation
Download: Fuzzpilz Oatmeal