Keywriter from Knobster.org  is quite a different VSTi and it’s for free.

Keywriter is a rompler that reproduce the sounds of a German typewriter «Erika». Can be used as a unusual rhythm machine, and as a tool for special effects.

Full range of typewriter sounds
Stereo control
Drive control
Low CPU usage

Link:
http://knobster.org/plugins/en/keywriter.html

A Roland 101 clonish fab sounding synth from TAL called ELEK7RO, do yourself a favour and try it out (it’s for free). For both Mac and PC computers.

2 oscillators with hardsync, PW and FM (saw, pulse, triangle, sine).
1 sub oscillator (saw, rectangle).
1 noise oscillator.
18dB or 12dB non linear analog modelled low pass resonance filter.
Mono mode, including portamento.
Poly mode, up to 6 voices (not cpu optimized for poly mode).
2 free routable Lfo’s (0.1Hz - 400Hz, sine, triangle, saw, rectangle, s&h, noise).
Filter and amplifier ADSR-envelope.
Free routable AD-envelope.
Mod-wheel and Pitch-Wheel support.
Midi Learn for all pots
Velocity to filter contour intensity.
Panic button.
Tutorial and installation guide.
Included factory presets - i’m shure, you do it better :-).

Link:
http://kunz.corrupt.ch/?Products:VST_TAL-Elek7ro

Another beauty from Odo called SeeqOne (VSTi only) - freeware!

 
5 sequencers:
1 sequencer is for “Notes and Octaves” but can also be used for filter, Pulse Width, resonance or Phase modulation.
2 sequencers are used as envelope decays mainly for cutoff and oscillator pitch but also for pulse width and phasemod or resonance.
1 “normal” sequencer (no decay fx) can also be used for the same destinations.
Gate sequencer with mix option.
3 oscillators (sine/saw/ramp/pulse/triangle) - octave/note and fine tune for all of them.
5 filters - low/hi/band/4pole/8pole - and a filter envelope with Attack, Decay, Sustain and Level.
An extra oscillator for FM/PM/PW.
2 LFOs.
2 decay FX.
Left and right delay.
Glide.
Soft distortion.
64 presets.

Link:
http://www.odosynths.com/vst.htm