Here’s what Tru Urban tell us about their free synth offering. Now, although it is designed for Hip-Hop and R&B, the sound palette would actually fit into many modern productions too.
"Synthetik is a free VST/AU plugin for Windows and Mac containing a selection of inspiring sounds for your Hip-Hop and R&B Productions.
"The Synthetik VST Plugin is more of a "semi-synth" because it does not have all of the traditional functions of a full synthesizer. Instead, you get really good quality sounds out of the box that can be tweaked using the LFO settings, Reverb and ADSR.
"The Free VST plugin also has glide control, Mono, Poly and Legato playing modes."
Download Synthetik VST absolutely free at: http://synthetik.tru-urban.com