vtkFlRenderWindowInteractor is a class which enables you to create applications with full VTK and FLTK integration and interaction. This means that VTK renders to your FLTK UI, and your FLTK UI interacts with the VTK pipelines. Standard VTK interactor styles and picking work by default. This code has been tested successfully on Linux, SGI Irix, Sun Solaris, and Windows (NT, 2000, and XP).
vxargs provides parallel versions of any arbitrary command, including ssh, rsync, scp, wget, and curl. One reason to use it is to control a large set of machines in a wide-area network or a big cluster. The main features are parallelism (for running many jobs at the same time), flexibility, visualization (users can monitor the total and per-job progress in a curses-based UI), and redirection, in which stdout and stderr of each individual job are redirected to files for further analysis.