From: PyMod: sequence similarity searches, multiple sequence-structure alignments, and homology modeling within PyMOL
BLAST
http://blast.ncbi.nlm.nih.gov/Blast.cgi
PSI-BLAST
http://www.ncbi.nlm.nih.gov/blast/Blast.cgi?CMD=Web&PAGE=Proteins&PROGRAM=blastp&RUN_PSIBLAST=on
MUSCLE
http://www.drive5.com/muscle/
ClustalW
http://www.ebi.ac.uk/Tools/msa/clustalw2/
Cealign
http://cl.sdsc.edu/ce.html
Modeller
http://salilab.org/modeller/