Plugins that i use the most in my music all are free

VST Istrument

YM synth
a ym chip sound emulation plugin
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Psg proto synth
A nes sound emulator
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Syntendo
a good reproduction of the nes sound good for sound fx and crazy rhytm
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transcender - dream sequencer - neon gate
This set of  plug is a must for trance music
Transcender is great for trance lead and more
Dream sequencer  is great for those small ambient loop
Neon gate a simple to use trance gate fx
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Odo dreamer
great synth for trance when pass in a gate its sound so great
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VST FX

mg trigger gate
A trance gate fx
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BJ plug in pack
a must have plugin pack
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dvs plugin pack
a small but yet powerful set of plugin

Note

if you plan on collaborating with me these plugin will need to be install in you computer in order to play or make music.
here is a great site for plug in resource
KVR