Robin Schmidt’s Music Engineering Tools has released a public beta version a new free synth VST for Windows, Straightline.
Description:
Straightliner is a straight-lined subtractive synthesizer in a modern guise. You will find the well known building blocks of classic analog synthesizers (4 oscillators, a filter, 2 envelope generators) patched together in the traditional way.
Now you [...]

Kammerl Audio has released a set of 5 free VST plugins for Win/OsX, complete with bizarro Goldfrapp-style synth babes:

Pitcher
Warm Distortion
Scratcher
Looper
Slicer

Let me know if you think the plugins are as disturbingly hot as their logos!
via AudioLemon

Odosynth’s 388911 bytes is a freeware/donationware Commodore 64 style virtual synth for Windows. 
Features:

1 oscillator with 4 difftent waveforms: Saw Triangle Pulse and Pitched noise
3 BPM sequencer with 7 rates and 2 to 8 steps .You can end a sequence or loop it.
The first sequencer has notes from c to b and octaves from -3 to [...]

 

  388911 Bytes Demo [1:51m]: Play Now | Play in Popup | Download

DSK has released OranZe, a new free SynthEdit VSTi for Windows.
Features:

2 OSC, 135 waveforms*
Phase mod.
Amp. envelope
Octave selector and microtuning
2 multi-mode Filter
2 LFO’s with 5 waveforms
1 extra LFO, with waveforms
LFO Routing Matrix
Note sequencer (32 steps)
Gate Sequencer (16 steps)
Light delay effect
Midi automation
Velocity response
Preset manager
Preset and step seq. “one click generator” (randomize button)

Preview OranZe below:

 

 Oranze demo [1:19m]: Play Now | Play in Popup | Download

Tonearm has announced the release of Vitamin L, a free system of over 100 shortcuts and tools developed for speeding up the workflow in Ableton Live.
It combines accelerated access to most frequently performed tasks with many functionality enhancements.
Features:

Context-sensitive mouse wheel assignment.
Easy keyboard access to many clip properties and envelopes.
Quick modes for adjusting clip gain, pitch [...]

SonicTransfer has announced the official release of their Ableton Live Skin Editor. It lets you make custom skins for Live so you can have it your way.
They’ve also got a growing library of skins that you can download.
People are going to eat this up - but it seems to me to be the sort of [...]

Rough Diamond Productions has a large collection of free VSTs for the PC, including delay, gate, ducker and compressor.
I’m on Mac - so if you give them a try, let me know what you think.

AudioWarrior has released a free virtual instrument, Free Djembe for Kontakt
Free Djembe is a studio-quality 24-bit instrument that allows you play your keyboard like a hand drum.
Free Djembe was designed using Kontakt and works best with an unweighted MIDI controller, such as the Oxygen 8. The instrument is mapped with 10 velocity layers with samples [...]

 

 Free djembe virtual instrument [0:20m]: Play Now | Play in Popup | Download

CodeAudio has released BeatBurner, a freeware Windows beat mangler.
Here’s what they have to say about BeatBurner:
Using innovative wave shaping and filtration methods, Beatburner turns innocent drum beats, loops or sounds into new, fresh and vibrant audio parts for you to incorporate into your musical arrangements.
BeatBurner comes with a myriad of sample loops to get you [...]

DSK has released Darkness Theory, a free Windows synth vst designed for ambient music.
Preview the sound of Darkness Theory below.
Features:

3 advanced OSC whit 53 waveforms
octave and pan selector
Amp. envelope and micro-detuner
3 HP/LP advanced pole Filter
3 LFO whit output routing
Midi automation
Velocity response

 

 Darkness Theory preview: Play Now | Play in Popup | Download

LFX-1310 is a free plug-in multi-effector that includes 24 types of effects and 3 serial slots.
Effectors :
- S’Filter 12 / S’Filter 24 / 3-band EQ
- Peak Compressor / RMS Compressor
- Overdrive / Distortion / Amp Distortion
- Crusher / LP Noise / Stereo Image
- Chorus / Flanger / Phaser / Auto Wah / Tremolo / Auto [...]

Yellow Tools has released a new free version of their Independence sampler workstation for Mac & Windows.
Independence Free 2.0 is based on the new Independence 2.0 version which will also be released sometime this month. Independence Free 2.0 comes with all the features of the Independence Sampler version 2.0 - only the import of audio [...]

B.Serrano has released the free Adonis 8 voice polyphonic VA / AM / FM synthesizer for Windows.
The interface uses multiple “pages” that let you control various types of synth parameters.
VOICE PAGE
Adonis has 2 independent Voices composed as follows:

4 waveforms with tuning, fine pitch and level.
These waveforms can be combined by 57 differents structures using [...]

Sion Software has released version 2.0 of their free QuickAudio audio editor for Windows.
QuickAudio lets you edit, play and record digital audio as well as convert between various popular audio formats. It has standard audio editing features, multiple undo, audio spectrum analysis as well as support for up to 24 VST plug-ins.

Neuenberger have released a beta version of their JellyFilter v2.0 freeware polyphonic lead synth for Windows.
Here’s what’s changed since the alpha release:

Fixing Filters: Only the experimental Notch Filter needs some update now
Noise Frequency now has an effect on the sound
The LED Switch of the User Interface has been updated such that it correctly shows the [...]