DiVerSe's Pre-fabs:

I find them useful in my SynthEdit programing - so you might, too. 
Also, I find exploring the guts of prefabs very inspiring for new patches, so I hope these prefabs will inspire someone...
 

Oh and another thing: If there's a SDK developper out there who wishes to create .SEP modules based on these architectures - you're welcomed!  I presume sep modules will be much cheaper in CPU and probobly more useful, but I don't do SDK stuff myself.  Anyhow if anybody accepts this challenge, please credit me in the documentation and let me know about it.

Oscillator Curver - this uses a simple ring-modulator patch to make curved bi-directional signals.  No "waveshaper2" module!  Good for giving more character to simple oscillators, but also useful for distorting any audio signal, and for creating non-standard LFOs.

Envelope Curver - based on the oscillator Curver, this prefab is used to curve uni-directional signals, particularly Envelopes.  This will give your synth a different character than any other SE synth.  Note that the curve also affects the level of the sustain!

Limiter - well not exactly a limiter but it does just the same.  This prefab will fold-back any signal that is louder than the threshold.  A good idea is to connect a couple of these prefabs in a row, especially if you're limiting to very low levels.  Try it on drums, oscillators or at the output of synths to avoid loud spikes.

Sample Delay Meter - This is a cool tool for measuring the time difference between two signals.  It's useful for monitoring the delay between the source and the output of a drum trigger plug, for creating a tap-tempo mechanism, and with some more manipulation it's the basis for a pitch-recognition patch (you'll need Chris Kerry's edge detector).  The delay is represented in milliseconds, but if you define sample-rate it'll also give a "samples" value, and given the host's BPM it'll show the difference in midi "ticks".

RoToR Engine  - this is the heart of my CombiNatOr synth.  It receives 4 audio inputs, and switches among them at a specified speed (the Pitch input).  The Smooth control lets you set the way waveforms are switched: from smooth crossfades to harsh switching.  You can also sync the RoToR - for example sync it to the midi2cv Gate to restart the RoToR position each time a key is pressed on the keyboard.

DC Fixer - DC offset occurs when audio is not centered at the zero line.  This happens because of bad recording conditions and sometimes in complex virtual synth patches.  The effect of a DC offset is an addition of very low frequencies that can overload your mix.  This module attempts to automatically fix DC offset, and will usually do the job...

Multi Osc - Are you tired of SE's standard oscillators?  This one is different: All waveshapes are derived from SE's triangle oscillator, but the sound is a bit more Xtreem...  It also introduces the "FATSO" waveform - a kind of a "fatter", "warmer", "vintage" Saw up/down.

PWM For All! - a waveshaper that'll work only on  Sines/Triangles/Saws.  It uses multiple ring-modulators to create PWM-kind effect for these waveshapes. 

Pitch Selector - a traditional "Octave/Coarse/Fine" pitch selector for oscillators.

These prefabs are all free but please TELL ME what you did with them.... I'm curious (-8

Also visit DiVerSe's VST pack - synths and audio manipulation tools built in SynthEdit