TreeView - Tree drawing software for Apple Macintosh and Windows.
BioEdit - Biological sequence alignment editor
SnapGene Viewer - SnapGene offers the fastest and easiest way to plan, visualize, and document DNA cloning and PCR. You can easily annotate features and design primers.
Clustal X - Multiple sequence alignment software.
UGENE - UGENE is free open-source cross-platform bioinformatics software
DNADynamo - DNA analysis, cloning and sequencing software