Neurobot

Neurobot plugin, it´s a very simple bass synthesizer plugin moded with SynthEdit.
This plugin is designed on phase distortion oscillation, counts with Amp Envelope, Modulation Envelope and Filter Envelope.
Simple based waveforms like Square, Saw, Pulse and Saw-Pulse are the core of this plugin.
The sync LFO with it´s two dedicated targeting options, provides the user to retrieve the best performance of Modulations and Filters. Use the 3 waveforms of the LFO and different speeds to create effects on your basses for long notes or short ones through the awesome targeting options.
The two filters of this plugin, one of them moog, turns this simple plugin phatter, and the targeting options for the Filter Envelope that cover both filters amplitude, drive the plugin into a higher state.
This VSTi also brings up a built-in Equaliser of 4 bands and frequency center.

http://www.beatassist.eu/neurobot/

FilterCrusher

FilterCrusher is a free dual filter effect built around a tube simulation circuit which is based on Audio Assault’s superb commercial tube amplifier plugin GrindMachine. FilterCrusher was developed byAudio Assault and it is available for free download exclusively on Bedroom Producers Blog. The plugin is released as a 32-bit and 64-bit VST/AU plugin for Windows and Mac.

http://bedroomproducersblog.com/2014/10/14/filtercrusher/

SGA 1566

Shattered Glass Audio has released SGA1566, a free plug-in for Mac OS X and Windows in AU and VST plug-in formats.

SGA1566 is designed to deliver the sonic beauty of a two stage, all tube, preamp using circuit simulation technology. SGA1566 is loosely based on a single channel vintage tube preamplifier. To achieve the most authentic analog sound, the whole circuit is simulated in real time using the high performance circuit simulator. This level of sound fidelity comes at a price of high CPU utilization. For cases where such a CPU hit is prohibitive, SGA have added a model that is significantly less CPU intensive but only slightly less accurate than the circuit simulation.

Use SGA1566 preamp to add warmth to a track, as a saturation compressor, or to add "dirt" with tube overdrive.

http://www.shatteredglassaudio.com/gear_list.php?id=digital

Cedr

Synthesizer + Step Sequencer

Saltline has released Drzewo Cedr – a free 2 oscillator subtractive synthesizer for Windows. with a 16-step pitch sequencer.
Cedr was created with chip tunes in mind.

The pitch sequencer can be turned on or off for each oscillator allowing for greater flexibility in sound creation. Bit crush and delay effects also add to the degraded yesteryear quality of Cedr.
Other controls include a step sequencer ‘step envelope’ giving the user the ability to create a range of sounds from choppy arps to strange pads and textures. 5 modulation slots also allow midi control routing, such as, key follow, velocity and aftertouch.

http://www.saltline.co.uk/cedr.html