The 1.0.27 version of RectFish is provided as a free download on our website. The software lies within Photo & Graphics Tools, more precisely Viewers & Editors. The actual developer of the program is AcaPixus. Our built-in antivirus scanned this download and rated it as virus free.
From the developer:
RectFish is especially useful for remapping images taken with circular fisheye lenses, such as the Sigma EX 8 mm f:4.0 or the Peleng 8 mm f:3.5. However, it may also be used for remapping images taken using diagonal fisheye images, such as the Canon EF 15 mm f:2.8 or the Sigma EX 15 mm f:2.8.
You may want to check out more software, such as SPX Editor, OpenEV or iCorrect EditLab Pro, which might be related to RectFish.