My name is John Posner. I live in Spring Lake, NJ -- in the "Jersey Shore" area.

This Web site supports my interest in educational software for kids, in the areas of elementary math and computer science.

I have been a computer software tech writer since 1977, with stints at Data General, Lotus Development Corp. (on the original development team for the Lotus 1-2-3 spreadsheet product), Stellar Computer, and Atria/Rational Software (on the original development team for the ClearCase version-control product). Most recently, I was at AccuRev, Inc., which produces the AccuRev version-control product ("ClearCase done better").

All downloads are free, licensed under the GNU Public License. Use the programs, use the code ... enjoy!

Visible Calculator -- (supersedes BlockHead) a point-and-click tool for performing all the integer arithmetic operations: addition, subtraction, multiplication, and division

Integer Bars -- a point-and-click tool for adding one-digit and two-digit whole numbers.

FracBars -- a point-and-click tool for adding or subtracting fractions.

ClixTur -- a point-and-click interface to the Python "turtle" module.

Venn -- attribute-block games, played on a Venn diagram.

BlockHead -- a point-and-click tool for adding or subtracting multiple-digit numbers.