This is the GNU C compiler, a fairly portable optimizing compiler for C.

This is the GNU Go compiler, which compiles Go on platforms supported by the gcc compiler. It uses the gcc backend to generate optimized code.

GIS::Distance calculates distances between geographic points on, at the moment, planet Earth. Various FORMULAS are available that provide different levels of accuracy versus speed.

PETSc is a suite of data structures and routines for the scalable (parallel) solution of scientific applications modeled by partial differential equations. It employs the MPI standard for all message-passing communication.

QGIS is a Geographic Information System (GIS) which manages, analyzes and display databases of geographic information.

KDecoration2 is a library to create window decorations. These window decorations can be used by for example an X11 based window manager which re-parents a Client window to a window decoration frame.