Crass is a program that searches through raw metagenomic reads for Clustered Regularly Interspersed Short Palindromic Repeats
Version 0.3.8 has been released with two bug fixes
Crass has been published in Nucleic Acids Research
Read the paper here
Crass outputs a standard xml file that describes all of the CRISPRs that it discovers. This file format is open source and is being developed to facilitate the interchange of CRISPR data between different research groups.