The most excellent file manager, Rox-filer, was written by 
Leonard Thomas. Unfortunately, development ceased in 2011.
(https://sourceforge.net/projects/rox/files/rox/)

I have been modifying it for years for use in Absolute,
and some others have been tinkering...
https://github.com/seirios/rox-filer
Then:
https://github.com/jun7/rox-filer

jun7 has been doing some serious work on the application.
I incorporated most of the Jun7 changes, and have included 
the diff files in the doc folder.

