An interesteing new VST, Sylfid-f1 is a VSTi audio plugin based on the physics of a string vibrating after the impact of a hammer at a certain veliocity, exactly as it happens in a piano. While not quite a novel approach, this is a step up in sophistication against other synths that are based on synthesising a wave from a given set of rules governing the audio waves themselves, giving a fully contiguous analogue of the sound(s) generated by the piano wire, the properties of the string being manipulable: that is to say, “you can change the material the strings are made of from plastic to metal, or adjust the shape and hardness of the hammer along with its position on the strings.”
The VST isn’t free ($150) but you can download a functional demo here that will work exactly as the full product, but will play random notes after a certain amount of time.
4Front -Yohng.com

This is a small and versatile upright piano module with unique sound; neither a sample player, nor synthesized. It’s a hybrid technology, that combines both methods. This resulted in a great module size reduction and light CPU usage. If you’re looking for a professional grade Piano instrument VSTi, then this might be what you’re after. Download from their website or by clicking here.
RMXL Synth – Krakli.com
RMXL is a re-release of a plugin previously included as a Computer Music exclusive. It is the best Richman synth to date with two totally independent sound sources and a wide variety of top class patches from electric-himalaya.com. All in all a very playable instrument. There’s also a raft of other synths and plugins free to download on Krakli.com
Leslie Organ – MDA-VST.com
A really comprehensive package of plugins here, including instruments, reverbs, cabinets – here’s the list:
Bandisto – Multi-band distortion
BeatBox – Drum replacer
Combo – Amp & speaker simulator
De-ess – High frequency dynamics processor
Degrade – Sample quality reduction
Delay – Simple stereo delay with feedback tone control
Detune – Simple up/down pitch shifting thickener
Dither – Range of dither types including noise shaping
DubDelay – Delay with feedback saturation and time/pitch modulation
Dynamics – Compressor / Limiter / Gate
Envelope – Envelope follower / VCA
Image – Stereo image adjustment and M-S matrix
Leslie – Rotary speaker simulator
Limiter – Opto-electronic style limiter
Loudness – Equal loudness contours for bass EQ and mix correction
Multiband – Multi-band compressor with M-S processing modes
Overdrive – Soft distortion
Re-Psycho! – Drum loop pitch changer
RezFilter – Resonant filter with LFO and envelope follower
Round Panner – 3D panner
Shepard – Continuously rising/falling tone generator
Splitter – Frequency / level crossover for setting up dynamic processing
Stereo Simulator – Haas delay and comb filtering
Sub-Bass Synthesizer – Several low frequency enhancement methods
Talkbox – High resolution vocoder
TestTone – Signal generator with pink and white noise, impulses and sweeps
Thru-Zero Flanger – Classic tape-flanging simulation
Tracker – Pitch tracking oscillator, or pitch tracking EQ
Vocoder – Switchable 8 or 16 band vocoder
VocInput – Pitch tracking oscillator for generating vocoder carrier input
Bandisto – Multi-band distortion
BeatBox – Drum replacer
Combo – Amp & speaker simulator
De-ess – High frequency dynamics processor
Degrade – Sample quality reduction
Delay – Simple stereo delay with feedback tone control
Detune – Simple up/down pitch shifting thickener
Dither – Range of dither types including noise shaping
DubDelay – Delay with feedback saturation and time/pitch modulation
Dynamics – Compressor / Limiter / Gate
Envelope – Envelope follower / VCA
Image – Stereo image adjustment and M-S matrix
Leslie – Rotary speaker simulator
Limiter – Opto-electronic style limiter
Loudness – Equal loudness contours for bass EQ and mix correction
Multiband – Multi-band compressor with M-S processing modes
Overdrive – Soft distortion
Re-Psycho! – Drum loop pitch changer
RezFilter – Resonant filter with LFO and envelope follower
Round Panner – 3D panner
Shepard – Continuously rising/falling tone generator
Splitter – Frequency / level crossover for setting up dynamic processing
Stereo Simulator – Haas delay and comb filtering
Sub-Bass Synthesizer – Several low frequency enhancement methods
Talkbox – High resolution vocoder
TestTone – Signal generator with pink and white noise, impulses and sweeps
Thru-Zero Flanger – Classic tape-flanging simulation
Tracker – Pitch tracking oscillator, or pitch tracking EQ
Vocoder – Switchable 8 or 16 band vocoder
VocInput – Pitch tracking oscillator for generating vocoder carrier input
Hopefully these will help you produce the next hit single to come from our music distribution service.