Here is the software for fitting height-age/site index models with the methods described in my Biometrics article (self-extracting archive, 128 Kb). This was developed for in- house use, so it is not as user-friendly as it could be. Other people has used it. though, sometimes with a bit of coaching; just ask. In addition to the readme and readme2 files there, you would need this documentation (in PDF, 52 Kb).
There are some additional model variants, etc., in here (zip, 527 Kb. Sorry, documentation only in Spanish.) Perhaps some day all this could be tidied up and organized better, if there is enough demand.
For a short description and a compiled MS-DOS version of GRAD, the program discussed in my Automatic Differentiation paper, look here. You can also FTP grad.zip from the SimTel archives, or from any of its mirrors under msdos/math/grad.zip, or search for grad with Archie.
The "3d-viewer" program has been around in the public domain for a while. It shows 3-d wireframe data on PCs, with real-time rotation under mouse control. Data is read from simple ASCII files. The distribution package contains an example of pine branches from work done with David Whitehead at FRI. It is also useful for visualizing 3-d statistical data, etc. Shows its age, hardly flash interfaces and cutting-edge technology, but still does the job. Available in SimTel and mirrors in msdos/graphics/3dv25.zip. More.
Method-of-moments method, with a shortcut. Here is a short text file with some notes and source code in Basic, C, and Pascal. Or try this applet (NEW!)
A simple compiled MS-DOS Basic implementation of the Golden Downs radiata pine model (zip, 30 KB).
Another no-frills PC simulator, compiled APL, for eucalypts in Chile (in Spanish, zip, 292 Kb.)
IFS, the original. Primitive user interface by today standards, but may have some historic interest (or even be useful, I understand that it is still used in places.) This demo version (zip, 49 Kb) was compiled for MS-DOS, and crippled by allowing no more than 4 crop types. If I ever find the earlier code that was offered for free with the paper I would put it here.
Some old Open Days demos (zip, 96 Kb, with English and Spanish versions).