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The CHIANTI package
Collaboration between UK, US and Italy.
Freely available and user-friendly. First release in 1996, most up-to-date and described with published papers.
Provides all atomic data (homogeneous) and IDL programs necessary for modelling spectra from collisionally-ionised plasmas. Mostly stellar coronae, but also used for a wide range of astrophysical objects (Chandra, XMM--Newton, FUSE, HST).
Included in many other spectral codes such as: XSTAR, APED/ATOMDB XSPEC, ISIS, PINTofALE
Notes:
Chianti is a region in Tuscany, Italy, that is famous for the red wine of the same name. The University of Florence (in Tuscany) is a collaborating institute.