Here are some programs I have written for various uses.
Calculate Rayleigh Scattering by Argon, Air, and CO2 as a function of pressure, temperature, and wavelength. (Perl source code).
Calculate Air Mass and Rayleigh Optical Depth for sunphotometer data analysis uses. (Perl source code).
Arduino code we wrote in 2013 for measurement and data logging CO2, T, and RH using the Telaire sensor, and the SHT75 temperature and RH sensor.
Fortran code to simulate measurement uncertainties and histograms of instrument response for the photoacoustic instruments (especially used during CARES).
Fortran code for calculating Angstrom coefficients, scattering, absorption, and extinction by spheres (two wavelengths). This code is NOT optimized at all, but gets the job done.
Labview program for controlling an ultrasonic anemometer; also provides measures of turbulence in quasi real time.