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.

Avogadro - Avogadro is a free, fantastically easy to use molecule editor.

BioEdit - Biological sequence alignment editor

ImageJ - and Other Health Care

DNADynamo - DNA analysis, cloning and sequencing software

ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.