International Levecor

IL Logo

"You can have it cheap, you can have it good, or you can have it on-time, but not all three. Pick two."

We picked cheap and good. We take time to develop our programs and we test them to make sure they work. And you risk little by trying them, because they contain no malicious code, don't hurt your computer, AND THEY ALL COST ONLY $2.99.

Interested in astronomy? Climate science? Or just general purpose apps? We concentrate on science, but there's something here for everyone!
(Or there will be--give us time!)

Important--how to buy this software!

1) Click on the "Buy Now" button. This will take you to a Paypal page--you can pay with your Paypal account, or if you don't have one, it will let you use a credit card or other options.

2) Once the payment goes through, click "return to International Levecor."

3) Click on the setup file for your program and download it.

4) Run it off your hard drive once you've got it, and it will install the program for you.



HR Chart displays a Hertzsprung-Russell diagram of 157 bright and nearby stars. The extensive help system explains what the HR Chart means and how to use it. If you want to learn about stars, this gives a lot of information in a nicely compact form.

Climate Science


SemiGen is the Semigray Greenhouse Scheme Generator. Want a fairly simple way to estimate planet temperatures? This program uses a simple power-law approximation to find the greenhouse effect of carbon dioxide, water vapor, and methane on a planet's atmosphere. It applies the results to Venus, Earth, and Mars. You pick the values, the program does the calculations. Comes with an extensive index of help topics.


USSA-76 gives the air density, pressure, and temperature at a given altitude according to the 1976 US Standard Atmosphere. Comes with help topics and charts of constants and unit conversions.

General Purpose Apps


A word processor like MS WordPad, but with a tabbed interface capable of handling several documents at once. It can change font, spacing, colors; insert special characters; add headers, print, print preview, etc. Try it! A lot more user-friendly than you-know-what.



Launch simulates a vertical rocket launch through the 1976 US Standard Atmosphere. You choose the parameters of the rocket, including size, fuel mix, fuel flow rate, drag coefficient, etc. Can be used for multi-stage launch simulations.

Additional links of interest:

Search Engine Submission - AddMe

ExactSeek: Relevant Web Search

Page created:11/16/2013
Last modified:  12/02/2013
Author:Barton Paul Levenson