DarkSky.com

Celestial Sphere: Online Virtual Planetarium
A sophisticated java applet showing 9000+ stars, planets, and messier objects.
www.pcsapo.com/

The Sky
planetarium program showing you the sky on any date, from any place on earth. Has features to benefit a wide range of interest levels, from the beginning hobbyist to the seasoned professional. [commercial, Win98/NT, MacOS]
www.bisque.com/

CyberSky
Astronomy program, that transforms the computer into a planetarium. [Windows 95/98/Me/NT 4.0/2000/XP]
www.cybersky.com/

XEphem
Interactive astronomy program for Unix systems with X Windows and Motif. [open source - Unix]
www.clearskyinstitute.com/

SkyTools
Observation planning, charting & logging software. [commercial - Win95/98/NT]
www.skyhound.com/

HyperSky
an astronomical data display engine allowing full control over what objects are displayed, with "hypertext-like" information about those objects. Beginning to show its age. The demo uses a DOS installer which failed to work on this reviewer's system. [commercial, demo available - Win3.1/95]
www.willbell.com/

SkyMap
a CD-ROM planetarium and star-charting program equally suited to both the casual stargazer and the serious amateur or professional astronomer, although its feature list will appeal especially to the more advanced user. [Commercial, demo available - Win95/98/NT]
www.skymap.com/

SkyChart
planetarium program displaying the sky from anywhere on Earth, in the solar system, or in the Milky Way, and for any point in time in the future or past. It supports numerous telescope computer controllers. [commercial, demo available - Win3.1/95/NT, Mac]
www.southernstars.com/

Deep Space
observer-oriented star mapping and telescope control software. [commercial, demo available - DOS]
www.davidchandler.com/

MegaStar Sky Atlas
resource for deep-sky observing. [commercial, demo available - Win3.1/95]
www.willbell.com/