B.L.A.S.T. 2.2 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The following version: 2.2 is the most frequently downloaded one by the program users. This free software was originally created by National Library of Medicine. B.L.A.S.T. lies within Education Tools, more precisely Science Tools. The program's installer is commonly called blast.exe.
From the developer:
BLAST is an algorithm for comparing primary biological sequence information, such as the amino-acid sequences of different proteins or the nucleotides of DNA sequences. A BLAST search enables a researcher to compare a query sequence with a library or database of sequences, and identify library sequences that resemble the query sequence above a certain threshold.
You may want to check out more software, such as Maxima and Minima, IUCLID5 or ECoord, which might be similar to B.L.A.S.T.