RAPT 6.6.8 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. You can execute this free PC software on Windows XP/Vista/7/8/10/11 32-bit.
The most popular versions among the software users are 6.5, 6.4 and 6.3. The software belongs to Photo & Graphics Tools. The actual developer of the free program is PCDC. The program's installer is commonly called rapt.exe or RAPTW.exe etc. We recommend checking the downloaded files with any free antivirus.
From the developer:
The RAPT analysis and design package for reinforced and post-tensioned concrete structural systems has been written and developed by practicing structural engineers as an everyday design tool. It is comprehensive in its treatment of the analysis and design of structural concrete.
You may want to check out more software, such as Awesome F-22 Raptor Screen Saver Lite, Raptor Shareware or Project Raptor, which might be related to RAPT.
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