Sound Grain by Olivier Bélanger is a graphical interface where users can draw and edit trajectories to control granular sound synthesis modules.

Free plug-ins by Vladislav Goncharov

Oszillos-Mega-Scope by Betabugs.de is a BPM-synced freeware oscilloscope with support for multiple inputs.

German academy for audio engineering, music production & drum programming

Home site of Guitar tools, a multi-platform application for Guitar and Bass Players of any style.

Site of the AnaMark VST synthetizer

HV Synth Design, a website dedicated to (mainly) physical modeled instruments.

Freeware VST instruments for Windows

Free creative audio plugins for Mac and PC by Gatis Ozols & Andrejs Eigus

Arthur Clemens (Visible Area) makes Soundfield, a visual audio mixer.