I wrote a software package called rna-pdb-tools. Hmm.. but now I have a problem. Is it?

> 
> Furthermore, rna-pdb-tools were used to curated structures submitted
>  to the RNA-Puzzles,
>  <https://github.com/mmagnus/RNA-Puzzles-Normalized-submissions>)
>  facilitating the comparison of structural models.
> 
> 
> 

or `was` used?

Or I should say "software rna-pdb-tools was used" or "package rna-pdb-tools was used" but "rna-pdb-tools were used"?