Multiple sequence alignment software

Since the last 2 decades, many bioinformatics software have come and gone but there are a few of the multiple sequence alignment software packages that stood the test of time:
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Multiple sequence alignments

A multiple sequence alignment is basically 2 or more sequences that have been optimally arranged, without changing the actual sequence of letters, to identify areas of similarity between the sequences.

The most basic case of a multiple alignment is a pairwise alignment which is basically the alignment of 2 nucleotide or amino acid sequences.  It would also not be too far of a stretch to say that it is the building block of virtually all forms of sequence analysis. A basic pairwise alignment between 2 short nucleotide sequences can look something like this:

sequence1      CTTA--ACACAT
               .|||  |.||||
sequence2      GTTATTAGACAT

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