If your program uses any Core Animation functions, it can be very handy to be able to exactly what the default curves look like when they're animating part of the user interface. This program has two "widgets" that are animated: a clock-like circular "hand" and a ball that animates from the bottom to the top of its container. As you drag on the curve's "handles," the animations will change to reflect the new values. Also, you can copy and paste either Objective C or Swift functions to Xcode. Download for Intel-based Macs, 10.9 and above. (file size: 895K)

Need to know the time in Tashkent? Or if it's daylight in Dakar? This simple application gives you the current time, daily sunrise and sunset times, and longitude and latitude for a large number of locations worldwide. You can even save the current window view as a JPEG. New version! Change the current time zone display with a right-click or "control"-click in the map. Also, choose whether or not to display locations representing the time zones, or latitude/longitude lines. Download the Universal Binary for PPC and Intel-based Macs. (file size: 1.6M)

Remember when you were a kid and you played with those gears and circles and made various spirals by rolling one inside or outside the other? Well, now you can do it with software! These curves are called trochoids (specifically hypotrochoids and epitrochoids). This simple application makes it easy to make these curves in varying colors and sizes and shapes:

In addition, the curves can be saved as PDF files for import into other programs like Illustrator or Photoshop, with or without the colored background. Download the Universal Binary for PPC and Intel-based Macs. (file size: 56K)

Okay, it's kind of a one-trick pony, but I happen to think it's sort of fun. It's a clock! But it's a different kind of clock: it's a binary coded decimal clock. The time is encoded with the colored squares. The red square are the hours, the green are the minutes and the blue the seconds. In the picture on the left, you can see the optional decimal clock display and the optional row value display. On the right, the application is just showing the binary coded clock. Download the Universal Binary for PPC and Intel-based Macs. (file size: 74K)

This is a simple little program that calculates the focal length multiplier for a number of digital SLRs. I basically picked the four cameras at random: Nikon D-100, Canon EOS-10D, Canon EOS-1D, and Sigma S9. If you'd like another camera model added, contact me at the email address in the Read Me file, and I'll add it for you. Download the Universal Binary for PPC and Intel-based Macs. (file size: 64K)