Downloading Tria 11.5.8 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 among Tria users are 10.1, 5.0 and 4.0. The software is included in Education Tools.
Tria.exe or _18be6784.exe are the common file names to indicate the Tria installer. 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 software is Quarktet. The program is sometimes distributed under different names, such as "Tria 2008", "Tria Yazlm", "Tria 2009".
From the developer:
Tria contains a specialized set of image processing algorithms that enable fast and effective deconvolutions, as well as many standard image processing tools. The program accepts both gray-scale and color images. Formats include bitmaps (8 and 24), jpegs, TIFFs (8,16,24,32,48,and 96-bit), FITS (8,16,and 32-bit, with FITS color), raw data files, and even delimited text files.
You may want to check out more software, such as SatCalc, MathMatic or MemBrain, which might be similar to Tria.