Squizz is a sequence/alignment format checker, but it has some
conversion capabilities too.

Most common sequence and alignment formats are supported :
- EMBL, FASTA, GCG, GDE, GENBANK, IG, NBRF, PIR (codata), RAW, and
  SWISSPROT.
- CLUSTAL, FASTA, MEGA, MSF, NEXUS, PHYLIP (interleaved / sequential)
  and STOCKHOLM.