A set of (mostly perl) scripts for manipulating tabular output from NCBI Blast's blastall and blast+ suite of tools.
See http://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Web&PAGE_TYPE=BlastNews#1 for more details about the NCBI Blast programs.
These scripts have come in very handy for filtering blast output, checking how much of a query or reference sequence is covered by a blast hit, etc.