CanoDraw 4.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program belongs to Photo & Graphics Tools. The actual developer of the free program is Petr Smilauer.
The latest version of the software can be installed on PCs running Windows XP/Vista/7/8/10/11, 32-bit. We recommend checking the downloaded files with any free antivirus. The most popular version among the software users is 4.1. The program's installer is commonly called CanoDrw4.exe.
From the developer:
Canoco recognizes at least three kinds of explanatory variables, depending on the role assigned to them in particular analysis: environmental variables, covariables, and supplementary variables. Ecologists often ask several different questions about the same datasets, and the individual questions are reflected in separate Canoco projects.
You may want to check out more software, such as graphite or Drawing Register Professional, which might be similar to CanoDraw.