Morphestra 2 is a virtual instrument developed in collaboration with Kirk Hunter Studios, that morphs together psychoacoustic-sampled symphonic winds, strings, and percussive instruments using the company’s Multi Core system to create “a dynamic world where music and sound design desirably collide”.
 

Anubis is a free synthesizer instrument plug-in for Windows.

Anubis Features

Lynx is a free synthesizer instrument plug-in for Windows.
 

Lynx is a subtractive/Phase Distortion synth with Drawable Waveforms and Stacked/Unison Oscillators.

Lynx Features

Aegis is a free synthesizer instrument plug-in for Windows.
 

Aegis is inspired by the old Amiga 500 softsynth Sonix by Aegis. It’s main features are the Drawable Oscillator and LFO waveforms and a special type of Phase Distortion.

Aegis Features

SUPER-7 is a free supersaw synthesizer plug-in for Windows.
 

Everyone who produces electronic music knows the infamous Supersaw of the Roland JP8000/8080, and even it`s a relatively old synthesizer this specific waveform or better sayed oscillator mode is still heavy in use and wanted. Also for myself, but more in terms of discovering how it works and how to emulate it.

Lokomotiv is a free retro style synthesizer instrument for Windows and OS X.
 

Lokomotiv is designed to make your sounds more powerful and create wide range of sounds way easier. It supports both Mac and Windows with native 64 bit processing.

Lokomotiv Features

Eclipsis is a free VST synthesizer instrument for Windows.
 

Eclipsis is hybrid wavetable synthesizer with three oscillators each with his own frequency and subtractive modulation.