There is a [FITS checker] at NASA, but it just uses [FITSverify] in [HEASARC]. [FITS checker]: https://fits.gsfc.nasa.gov/fits_verify.html [FITSverify]: http://heasarc.gsfc.nasa.gov/docs/software/ftools/fitsverify [HEASARC]: http://heasarc.gsfc.nasa.gov/
