DuploQ is a GUI frontend for Duplo duplicate finder console tool. Its goal is to find duplicates (i.e. copy-pasted parts of code) across several source files.
Currently DuploQ directly supports C, C++, C#, Java and JavaScript languages, but it can be used for other languages as well.
Microsoft Windows and Linux platforms are supported.
Since DuploQ is based on Qt C++ framework, it can easily be ported across several platforms.
Looks like the tools fulfill different tasks.
fslint looks for duplicated files (i.e. files which are 100% identical), while duploq looks for duplicated file fragments (i.e. copy-pasted parts of code).