Download of AFSD 4.43 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most popular version of the software 4.4. This free software is an intellectual property of Hervé Sors. AFSD lies within Games, more precisely Utilities. AFSD.exe is the most frequent filename for this program's installer.
From the developer:
Advanced Flight Simulator Data (AFSD) is a test program designed to investigate FS internal functioning. The program simultaneously accesses and calculates sophisticated aerodynamical data from Peter Dowson's FSUIPC interface, aircraft binary (.air) and configuration (.cfg) files. AFSD works with FS2004, FSX and P3D. FSUIPC version 3.99 or higher is required for FS9 and FSUIPC version 4.942 or higher for FSX/P3D.
You may want to check out more software, such as rFactor Ignition, TibiaTek Bot or Source SDK Base, which might be related to AFSD.