Dendrochronological Program Library. A set of essentials.
CooRecorder and CDendro - programs for on-screen measurements and crossdating (recommended!)
Software Package for Processing Climatological Data by Petr Stepanek (alternative link)
FHX2 Fire History Software by Henri Grissino-Mayer
DendroClim 2002 - correlation and response function analyses by Franco Biondi
Software from the Tree-Ring Lab, Lamont-Doherty Earth Observatory