UGENE - UGENE is free open-source cross-platform bioinformatics software
BioEdit - Biological sequence alignment editor
Geneious - Geneious combines all the major DNA and protein sequence analysis tools into one revolutionary...
DNADynamo - DNA analysis, cloning and sequencing software
Clustal X - Multiple sequence alignment software.
TreeView X - TreeView X is an open source program to display phylogenetic trees.