TracPlane 3.0 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 program is J-C. Etiemble. We recommend checking the downloaded files with any free antivirus. The common filename for the program's installer is TracPlane.exe. The most popular versions among the software users are 3.0, 1.8 and 0.9. TracPlane is categorized as Photo & Graphics Tools.
From the developer:
TraCPlane provides calculations and sketch capabilities for scale models. It can draw on a draft the input data for the wing, stabilizer, fuselage (glider or plane), fin, and ruder.
You may want to check out more software, such as Win4D Advance or FRED Optical Engineering Software, which might be similar to TracPlane.