There was a download of TachyCAD 220.127.116.11 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program relates to Photo & Graphics Tools. We recommend checking the downloaded files with any free antivirus. This free program is an intellectual property of kubit GmbH. The following versions: 9.0, 6.0 and 4.0 are the most frequently downloaded ones by the program users.
From the developer:
TachyCAD works as a direct plug-in to the latest versions of AutoCAD and AutoCAD LT. This program is a solution for measured building surveys which make it easy for anyone, expert or amateur, to achieve precise and efficient results. It is designed for fast and efficient on-site surveying and data capture.
You may want to check out more software, such as Plate 'n' Sheet Development Pro., CAD To DMC or GeoMoS, which might be related to TachyCAD.