External packages
- ctio: Tools for the Cerro Tololo Inter-American Observatory
- fitsutil: Utilities for single and multiple FITS files
- mscred: Mosaic CCD reduction package
- nfextern: General IR reductions/NEWFIRM package
- rvsao: IRAF Radial Velocity Package from SAO
- sptable: IRAF package for tabular spectra
- st4gem: Selected tools from STSDAS for use by the GEMINI package
- xdimsum: Deep Infrared Mosaicing Software