Glossary

C
Programming Language originally created by Dennis Ritchie in 1972. One of the most popular programming languages of all time, it is also one of the most influential. C++, Java, Javascript, and Python all inherit from the syntax, if not the style, of C. The most recent ISO standard of C was released in 2011, and is often refered to as C11. Indisputably the king of systems and embedded development, C is the primary language used by OpenCTR projects.
C++
Extension of C designed to add Object-Oriented features. Because all valid C code is also valid C++, software compatible with both C and C++ will often refer to both as C/C++. More widely known than C in most mainstream development, C++ is not suitable for developing the system level programming that makes up OpenCTR, due to its runtime requirements, heavier overhead, and greater binary size. Still perfectly okay to use C++ when developing your own applications though. An object-oriented wrapper for libctr is forthcoming.
Citra
http://citra-emu.org/. Cross-platform Nintendo 3DS emulator (without stereoscopic 3D support though). Written in Qt4. More actively developed than 3dmoo.
3dmoo
https://github.com/plutooo/3dmoo. Alternative to Citra. Less support for commercial games, but more hardware accurate emulation.
3DSX
File format for Nintendo 3DS homebrew. Able to be executed on any homebrew-enabled Nintendo 3DS console, as well as the Citra and 3dmoo emulators. For more information about 3DSX, see http://3dbrew.org/wiki/3DSX_Format.
Clang
A relative new-comer to the world of compilers, LLVM was originally the Low Level Virtual Machine developed by Chris Lattner as a university thesis project. Since then, LLVM has been backed by Apple and Google, among others, and developed into a C/C++ compiler capable of rivaling GCC. Having risen to the same heights that it took GCC 25 years to reach in 7 years, LLVM/Clang support will be coming to OpenCTR soon.
GCC
The GNU Compiler Collection (originally called the GNU C Compiler) has been the defacto cross-compiler of choice for the past 20+ years. Although GCC has faced competition in recent years, in the form of Clang, GCC remains the most powerful and versatile compiler for many architectures and platforms. Hence its status as the default cross-compiler for OpenCTR.