tilsotua calculates the world-coordinate system (WCS) positions of slits in multislit mask designs used for the Low-Resolution Imaging Spectrograph (LRIS). The package ingests slit coordinate information stored in FITS files from mask design archives or autoslit outputs and reconstructs the corresponding slit positions in sky coordinates. It applies optional astrometric corrections by comparing alignment star slit locations to modern catalogs to refine the slit WCS positions. tilsotua outputs updated FITS files with filled slit center coordinates, CSV tables of slit corner and center positions, DS9 region files for visualization, and quick-look plots of mask geometries. The software supports reusable Python interfaces and command-line workflows for processing observational mask data.

FRB performs calculations, estimations, analysis, and Bayesian inferences for Fast Radio Bursts, including dispersion measure and emission measure calculations, derived properties and spectrums, and Galactic RM.

PypeIt reduces data from echelle and low-resolution spectrometers; the code can be run in several modes of reduction that demark the level of sophistication (e.g. quick and dirty vs. MonteCarlo) and also the amount of output written to disk. It also generates numerous data products, including 1D and 2D spectra; calibration images, fits, and meta files; and quality assurance figures.