Luminance HDR Product: Luminance HDR v2.0.2 Website: http://qtpfsgui.sourceforge.net Type: Open Source Requirements: Windows XP/Vista/7 Luminance HDR is an open source graphical user interface application that aims to provide a workflow for HDR imaging. Creating HDR files is very easy: you just drop your bracketed shots from file or photos manager to the main window and in few more clicks you have an HDR file which you can then tonemap.