Download These!

-synth1,
-superwave p8,
-oxesynth,
-oatmeal,
-polyvoks,
-Ultrasonique,
-DSK plugins,
-organized trio.

Some of them may not have great stock sounds but the sounds they can make is what matters most =D ideal if you produce electronic music.

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I personally like Ultrasonique (hard to find to download) and SuperWave (Roland JD800 sounding VST). To find, just type the name into Google and there are plenty of sites to choose from.