GDC is a utility to calculate compressible flow (Gas Dynamics Calculator). It provides calculations for isentropic nozzle, isothermal nozzle, isothermal, Fanno (choke and unchoked), Rayleigh flow, etc. It also provide calculations for shock and oblique shock by direct calculations (no iteration, probably the only one that can do it). GDC also calculates shock dynamics, i.e gas running into a different medium with different speed. The result are in plain text, LaTeX, or a range of values. License: GNU General Public License (GPL) Changes: This release builds a new utility named obliqueFigure to generate oblique shock figures. Range calculations have been improved so that larger and more details can be provided. The "Naughty Professor" calculations have been improved. Some bugs in the oblique shock class have been fixed.

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