Analysis is a tool that can draw 2D and 3D graphs of functions with different characteristics. Implicit f(x,y)=g(x,y)form curves are plot in a xy plane. Free download for all Windows versions
http://www.geocities.com/leibowitz.geo/analysis_en.html
Editing and conversion of 3D medical images to files for medical modeling via rapid prototyping.
http://www.anatomics.net/products_services/biobuild_software.html
Valve data includes various types which may be used in the Racal RA17L HF receiver.
http://www.pamandandy.demon.co.uk/valves/index.html
An outstanding online course covering pulse modulation, PSK, and FSK that starts from scratch and builds up to near-expert level material
http://www.tpub.com/neets/book12/49.htm
This is another Plasma Tweeter very similar to that made by Ulrich Haumann.
http://www.geocities.com/ResearchTriangle/Thinktank/1866/plasma.htm
Planetary and moon images and equipment details.
http://astrosurf.com/cidadao/
Information about AO-10, including status updates on a periodic basis.
http://www.cstone.net/~w4sm/AO-10.html
general purpose nonlinear circuit, system, and electromagnetic FDTD simulation and design program
http://www.aplac.hut.fi/aplac/general.html
electronics circuit simulation program. uses Spice component models, very suitable for RF simulation.
http://www.aplac.hut.fi/aplac/
http://www.hardwarebook.net/connector/userinput/macjoystick.html