Downloading OptiFDTD 12.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the software 12.0, 11.2 and 10.1.
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 actual developer of the program is Optiwave Systems Inc. OptiFDTD is categorized as Photo & Graphics Tools. BPMTools.exe, OptiFDTD_Analyzer.exe, OptiFDTD_BandSolver.exe or OptiTools.exe are the common file names to indicate this program's installer. The latest version of the software can be installed on PCs running Windows XP/Vista/7/8/10/11, 32-bit.
From the developer:
OptiFDTD is a comprehensive and powerful CAD environment that enables the design and simulation of advanced passive and non-linear photonic components.
OptiFDTD enables you to design, analyze and test modern passive and nonlinear photonic components for wave propagation, scattering, reflection, diffraction, polarization and nonlinear phenomena.
You may want to check out more software, such as EasyPlan, VFDS or progeCAD 2008 Smart!, which might be related to OptiFDTD.