Notation Softwares, MIDI Sequencer...

Manufacturer of shareware and freeware programs for Macintosh: Amadeus II, FractalDesigner...

Nuklear, software synthesizer with advanced pulsar train synthesis

Professional audio plugins

Virtual instruments for Mac OS X and Windows.

HERCs Music Systems is an Australian company that designs algorithmic software and VST tools for sound synthesis.

HighC is a graphical music creation and composition software tool. Its goal is to make music scomposition as simple and direct as sketching.

Hip hop composer purposes some sound banks and bundle to compose in Hip Hop Style with Reason (Propellearhead). You can get some free refill files and pay for others.

Web tools and audio plug-ins by Saverio Vigni

Software for Thermal Analysis and Audio Recording.