We have been using R for our data analyses for several years, and accumulated expertise and scripts for calculations related to photobiology. After more than two years of work of programming and documentation writing, in the last year I have submitted eight packages to the CRAN repository, packages that are now widely available for anybody to use. All code and documentation is open-source and open-access.
There are still more packages under development of which the ones I find more interesting are two that allow direct acquisition of spectral data from within R allowing use of all the power of R to analyse spectra in almost real time during measurements. They also incorporate state of the art correction algorithms for array detector spectrometers.