Credits
The Cooltune designs, were created with assistance from:
AJHorn Loudspeaker Simulation Software 
AJHorn is a calculation program for any loudspeaker, especially Horns and Transmissionlines.
LTspice IV is a high performance SPICE simulator and schematic capture including models for easing the simulation.
FreePCB Printed Circuit Board Editor
FreePCB is a free, open-source PCB editor for Windows. It was designed to be easy to learn and easy to use, yet capable of professional-quality work.
A CAD System for everyone. QCAD is an application for computer aided drafting in two dimensions 2D. With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts and diagrams.
Gerbv is a free open-source viewer for Gerber RS-274X files, Excellon drill files, and CSV pick-and-place files.
Speaker Workshop makes it possible to design and test loudspeakers using a PC with a sound card. It is a free, very feature-rich technical product for people serious about designing their own loudspeakers.
The Cooltune website, were created with assistance from:
Abyss Web Server turns your computer in a full-featured web server. It was designed with both novice and experimented users in mind. That's why it is easy to use and incredibly powerful.
Typesetter CMS (Content Management System)
Open source CMS written in PHP focused on ease of use with true WYSIWYG editing and flat-file storage.