| ASTRO | Astronomical Utilities |
| IDLPHOT | DAOPHOT-Type Photometry Procedures |
| DATABASE | Database Procedures |
| DISK_IO | Disk I/O (e.g. IRAF files) |
| ASTROM | FITS Astrometry and Calibration |
| SDAS | STSDAS Image manipulation |
| FITS_TABLE | FITS ASCII & Binary Table I/O |
| FITS_BINTABLE | FITS Binary Table Extensions I/O |
| FITS | FITS I/O |
| MATH | Math and Statistics |
| ROBUST | Robust Statistics procedures |
| STRUCTURE | IDL Structure procedures |
| SOCKETS | Web Socket Procedures |
| TV | TV Display Procedures |
| MISC | Miscellaneous (Non-Astronomy) Procedures |