Neat, well organized and full featured program. The basic installation package includes the BSC5 and SAC catalogues (10.000 stars and as many deep sky objects) but you can also download and use both the Sky2000 and Tycho2.
Among others, Winstars includes tools to calculate the most relevant ephemeris for a given period of time; to represent the FOV of any eyepiece; the ability to get online from DSS (Digital Sky Survey) real pictures for a given area either in visible light, red, blue or infra-red spectrums and a graphical tool to represent the position of
the natural satellites of Mars, Jupiter, Saturn and Uranus (additional module).
It is also capable of guiding a telescope.
Get additional modules&functions (milky way representation etc...) and object catalogues from the homepage.