The Finn Matti Jokipii has launched Kairatune, a free VST synthesizer for Windows. With Kairatune you can make beautiful, thick lead and bass sounds. The synthesizer has a nice interface and is left monophonic because of the high CPU load. It is highly recommended if you want to try a new VST plug-in, because it sounds wonderful.
On the KVR Audio forum the synthesizer is discussed by VST plug-in enthusiasts. In the following demo song Kairatune is widely used: