This is a program to demonstrate the formula for parabola in vertex form. That's y = a * (x - h) ^ 2+ k. It's great if you are learning or teaching algebra. Just manipulate a, h and k with the sliders and watch the parabola change shape.
This is a program for building geometric constructions. It lets your expensive and highly sophisticated computer do nearly everything that Euclid could do thousands of years ago using a compass and straightedge. Of course, it one ups Euclid. Unlike working with a pencil and compass, you can move your free points and watch your construction change interactively.
Download (Mac): Constructomatic.app.zip (3.6 MB)
This is an equation solving program. You enter a set of equations and the values for the variables you know. It figures out the ones you don't know. It includes an iterative solver which you invoke by giving it a guess value that is in the right range, and it takes it from there. This is rather experimental, and can be a real brain saver when doing design problems.
This is our Kaleberg surprise hit. Give it your latitude and longitude, some info about your time zone, and it cranks out an iCal calendar showing sunrise and sunset. That's it. It grew out of our TideCal and TideFinder software (see below), but it is surprisingly popular, where Kaleberg popular means dozens of downloads a year, and even a few notes from happy and less happy users.
Download: sunrisesunset.app.zip (3 MB)
Kaleberg Concordance is a simple program that does one thing moderately well. It reads in a text file and counts how many times each word was used. We wrote this because we were reading Nietzche's "Gay Science" and were wondering how often he used the word "nauseous". (Of course, he was writing in German, so this might have been the translator's choice of words, not Nietzche's.)
Download (Mac): Kaleberg Concordance (2.8 MB)
Gimme! is a hot key program for the Macintosh that lets you quickly and easily use search engines besides Google. Hit the hot key, usually F3, then just type in where you want to search and what you want to search for. Hit return and Gimme!, and your browser, and the web site in question, do all the work. The Gimme! program is freeware, simple and easy to install. It even comes with a handful of useful searches to give you some ideas.
Volvelles consist of two cardboard wheels with a common axle and are used for displaying one row of time from a table of data. The front wheel has slots for displaying the data which is printed in a rotary symmetric pattern on the rear wheel. The Volvelleteer program from Kaleberg Symbionts is Freeware for making volvelles. [Macintosh OS X, Classic and PC versions] [Requires Quicktime]
|TideCal and TideFinder
While there are many programs for producing tide tables, there do not seem to be any programs for finding a suitable tide. For example, if you want a low tide during the day for exploring Cape Alava or walking the Dungeness Spit, you have to wade through listings of high and low tides. Tide Finder program is based on FlaterCo's XTide 2.6 package, and provides a Mac OS X friendly user interface for specifying a tide search. You specify a tide reporting station, a range of dates, a desired range of times and the desired tides, high or low. It gives you a hit list, a calendar and a tide graph. [Macintosh OS X only]
Nowadays they print computer circuits on silicon wafers, but did you know that they used to print them on cardboard? That's right. Bell Laboratories, back in the day, printed a computer on cardboard for teaching how computers worked. They still work like that but much faster. Kaleberg Laboratories, in our neverending competition with Bell Laboratories, has decided to offer a computerized version that lets you type in machine language programs and watch them execute, step by step. It's a great learning tool.