Eclipse is a graphical source code editing program.
Expat is a stream-oriented XML parser library written in C.
f2c is a program to convert fortran source code to C source code.
gdb is the GNU project debugger
Git is a version control system for managing source code trees.
GNU Make is a software compilation program.
C, C++, and Fortran compilers from the GNU project.
Guppy is a programming environment providing object and heap memory sizing, profiling and analysis.