Used Palms have become cheap and so they can be used as an inexpensive counter, for example while visiting winter roosting sites. You will probably find many more uses...
The software "counter4" implements 4 independent counters. You can enter different designations for each counter. The buttons "reset" "+1" and "-1" really do not need to be explained. Each counter can also be incremented by the "hardbuttons" below the display. After counting, you can store the results into a Palm memo (date and time will be saved, too). The next hotsync transfers the memos to your PC for further processing.
The software is free for non-commercial use.