From the documentation:
SAM Tools provide various utilities for manipulating alignments in the SAM format, including sorting, merging, indexing and generating alignments in a per-position format.

CyVerse UK provides the following SAMtools applications:
  • convert SAM to sorted BAM
  • index BAM file
  • index BAM file and get stats
  • sort BAM
  • index FASTA file
See the official website for more details.
  • Li H.*, Handsaker B.*, Wysoker A., Fennell T., Ruan J., Homer N., Marth G., Abecasis G., Durbin R. and 1000 Genome Project Data Processing Subgroup (2009) The Sequence alignment/map (SAM) format and SAMtools. Bioinformatics, 25, 2078-9. [PMID: 19505943]
  • Li H A statistical framework for SNP calling, mutation discovery, association mapping and population genetical parameter estimation from sequencing data. Bioinformatics. 2011 Nov 1;27(21):2987-93. Epub 2011 Sep 8. [PMID: 21903627]