MellowMuse Mellowhead is a guitar and fx modeling plug-in for OSX.
Description:
The emphasis here is on creating the raw organic sound of a miced tube amp. There are 10 convolution based speaker cabinets and 10 different pre-amp/tone settings, ranging from clean to brutal distortion, as well as 3 band tone controls. The 5 effects pedals, reverb [...]

InstantSampler is a freeware simple sampler for Mac and Windows that records audio from the audio input when a MIDI note is played for the first time.
Any consecutive time you play the same note, it plays back the recorded audio with the possibility to vary or trigger:

Velocity.
Attack and release.
The level of the input [...]

Bitter Sweet II is a freeware dynamic processor for managing audio transients, available in RTAS VST & AU formats for Windows & Mac.
Description:
Bitter Sweet II is especially active on loud percussive tracks.
Turning the central button on the sweet side, decreases the transients amplitude. On the bitter side, the transients amplitude is magnified.
Bitter-Sweet also features a [...]

MixMeister has announced MixMeister Fusion and MixMeister Studio 7.2. This release marks the first Mac versions of MixMeister.
Version 7.2 of both packages includes the following:

Native Mac OSX version is universal binary for PowerPC or Intel processors
Improved time stretching accurately matches beats with fast or slow tempos
Enhanced timeline display provides clear division of measures
Effect automation via [...]

Awesome Synthopia reader Anya Graham translated a recent Jean-Michel Jarre interview for us, and I thought it would be great to share. Thanks Anya!
The intervew has a strong Apple focus, but is still interesting for its insight into how this synth music pioneer uses current technolog:
You’ve used Apple products for a long time, which models [...]

KResearch has released the KR-Reverb FS version 1.1.0, a free reverb processor.
Features:

Adjustable Early Reflections Size
Adjustable Late reflections size
Adjustable Diffusion control
Adjustable Decay control
Adjustable Listener position control
Dry/Wet Mix adjustment.
Host Sampling Frequency up to 96KHz
For Microsoft Windows OS (VST)
Suitable for all Pentium CPUs
Mac OS X (AU UB,VST MAC)
Support for User definable presets
(Save & Load) via Host interface

It’s available for [...]

Future Audio Workshop has released Circle, a new virtual synth for Mac & PC that’s designed to be easy to use.
Features:

Visually Design Sounds - Simply move colour coded circles around the interface to start creating your own unique sounds. Preview the connections by just hovering the circle beneath a knob. Explore sound in an intuitive [...]

Algomusic has released MaxScore, a Max object which accepts messages that can create a score, add notes to it, transform them, perform it, save and load the score, as well as export the score to popular formats for professional publishable results.
Description:
MaxScore is more than a notation tool. It is an interactive performance object. MaxScore [...]