Amplicon is a Python script for designing PCR primer sets. Amplicon is written in Python 2.3 and Tkinter 8.4. The current script was created for Windows and an executable is available. Future versions of the script should be able to run on Linux and Mac
For interactive clustering and visualization, Cluster and TreeView by Mike Eisen are great. XCluster by Gavin Sherlock solves the problem of clustering large numbers of files. Now slcview allows you to script generation of cluster and tree images.