One-Two-3DO 1.25 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 actual developer of the free software is CWE.
The following version: 1.2 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus. The most frequent installation filename for the program is: OneTwo3DO.exe. One-Two-3DO is categorized as Photo & Graphics Tools.
From the developer:
With One-Two-3DO you can define vertices yourself or load vertex definition from a file, using the Geometry Menu. Once vertices are set-up, you can draw colored polygons or lines from these vertices by selecting them with the mouse, almost like using a CAD program. There's also an alternative method to define polygons or lines where vertex indices can be given manually from a drop-down-list.
You may want to check out more software, such as CAD To DMC, which might be similar to One-Two-3DO.