Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions
and and Russell Croman's GradientXTerminator.
eXcalibrator for (u-g), (g-r) color calibration, using 15 stars
from the SDSS-DR7 database.
PixFix32 (pre-beta) to
repair column defects.
CCDStack to calibrate,
register, normalize, data reject, combining the sub exposures
and LRGB combine
LLRGB combine and adding the Ha data to the red channel, with the
lighten setting for opacity.
Noiseware Pro, a PhotoShop