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Synth1 is a free software synthesizer. Functionally it is modelled on the Clavia Nord Lead 2 Red Synth.
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PanCake's LFO can be beat-synced to your DAW, from a fast 1/128 note modulation up to 32 bars.
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TAL-NoiseMaker is an improved version of TAL-Elek7ro and has a completely new synth engine and a lot of improvements in sound and usability.
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ValhallaSupermassive has been designed from the ground up for MASSIVE delays and reverbs...
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Oxe FM Synth is an open source VST 2.4 instrument plugin for Windows, Linux and Mac OS X.
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Selected best frequencies from 4 different well-known modules and now with custom line amp and proper oversampling. 
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Grab this free plug-in emulation of the famous Casio CZ-101 Organ Patch in VST3 and Audio Unit format today.
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Free Virtual Analogue Synth For Windows...
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Its unique reverb diffusion makes it a perfect companion for all kinds of delay effects and a perfect fit not only for vocals and drums.
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Vaporizer 2 is a hybrid wavetable additive / subtractive VST / AU / AAX synthesizer / sampler workstation. The heart of this plugin is the alias-free versatile high-performance wavetable sound engine with low system CPU resource usage.
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NEL is a vibrato plugin. It uses a feed-forward delay to modulate the signal in pitch and time. Various modulators can be used to create all kinds of vibrato textures, which makes this plugin pretty versatile.
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Fathom is a modular software synthesizer plugin that features a wide variety of audio components, advanced modulation, detuning and distortion capabilities as well as the ability to draw your own waveforms and import single cycle waveforms from outside sources.
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