Sky Charts 2.7X
Who said you needed to buy an expensive Cd-rom to have a quality sky atlas ?
Sky Charts computes and prints customized charts of the heavens. When you download the program ("basic package") it comes with the Bright Star Catalogue (featuring stars down to mag. 6.5) and a database of 10'000 nebulae from SAC 7.2. Optionally, you may choose to download the "complete package", including also Sky2000, version 3, with 300' 000 stars to magnitude 9, high precision planetary satellites positions and Realsky support.
Anyway, the point is for you to later get additional free catalogues from its homepage, according to your interests and specific needs. For instance, Tycho-2 with more than 3 millions stars, down to mag. 12.1; a catalogue of 68'179 variable stars from GCVS, NSV and EVS; a database of 193'898 galaxies from PGC1999 catalogue etc, etc...
Simultaneously supports English, French, Portuguese, Italian, German, Spanish, Catalan, Dutch, Polish, Czhec, Thai, Hungarian, Serb, Russian, Croatian (and quite a few more languages) menus.
Main features offered include:

• about 30 catalogues of stars, star clusters, nebulae and galaxies;
• ability of demanding portions of star catalogues online so as to plot charts until mag. 20;
• facility of self-updating online, from different sources, the comet and asteroid elements databases;
• option to request from SkyView - Digital Sky Survey, and similar sources, real sky images of the region drawn on the chart - with the ability of superimposing and easily editing, filtering and chromatically juggling them;
• DDE interface allowing the joint use with VAROBS - another freeware by Patrick Chevalley, consecrated to variable stars;
• interface for telescope control;
• additional support of Real Sky and USNO Cds etc, etc...

Virtual Moon Atlas
«This software can visualize the Moon aspect for every date and hour. It permits also to study lunar formations with unique database and pictures library compiled by Christian Legrand.
It's conceived to be easily usable "in the field" according to an observing session needs, but also to study "at home" the Moon and its relief. It's interfaced with "Sky Charts" freeware (above). This set is certainly now one of the most complete released.
It's possible to choose the language used by the software and database. Presently the program supports English, French, Portuguese, Russian, Spanish, Chinese and a few more languages amounting to a total of 15 (you might have to separately download specific language files tough).
Files have been cut in several packages. The only mandatory package is the "Basic package". You will find several other files in the homepage. See a screenshot.

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Calenda 1
Shows the position of the terminator over a lunar surface map, pointing (literally) and naming the craters currently nearby. Also offers a calendar with lunar ephemeris. In French. See a screenshot.

Freeware; Windows 95 and above; 1.8 MB.
Homepage || Download || FTPsearch

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Mars Previewer II
Shows the current phase of Mars and allows you to point and identify the most prominent features, displaying their coordinates. There is also available a Windows 3.1, 16 bits version. See a screenshot.

Freeware; Windows 95 and above; 2.04 MB.
Homepage || Download || FTPsearch

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PRODOBS [NEW ADDITION]
«PRODOBS is a deepsky database developed in Javascript, so one could use it as a kind of plug-in for the Internet browser. It contains 1152 objects from the SAC database up to 11 mag and will allow the user to create sophisticated queries (PRODOBS uses the engine of the open-source-project jsSQL).
Furthermore, PRODOBS contains a sky atlas and detailed finder charts for each deepsky object (created with GUIDE). If the user is interested, he/she can follow object-related links to astronomical servers like NED, SIMBAD and WEBDA in order to get more information.»
German only. See a screenshot.

Freeware; Aprox. 1,67 MB + optional extra charts (1MB+6,5MB+3MB).
Homepage || Download base || 110 finder charts of the Messier's Catalogue
|| 766 charts of NGC objects || 276 charts of other catalogues

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LunAtlas
Photographic Atlas of the Moon done with CCD photos. Meant to let users easily identify lunar features. In French. See a screenshot.

Freeware; Windows 95 and above; 11 MB + picture files.
Homepage || Download Program || Pictures I || II || III || IV || V || VI || VII || VIII || FTPsearch

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Moonman
Supposedly plots in real time the progression of the umbra over the lunar surface, but it does so with an extreme lack of precision. Still, it is very useful as a lunar map, to identify the craters.
Get this one only if you are running a very old PC with few resources. Otherwise you will be much better served by any of the newer programs above. See a screenshot.

Freeware; DOS; 50 KB aprox.
Download || FTPsearch

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Other freeware programs in this category (links to the homepages)

Celestial Maps

StarCat

NOTE: Most planetariums also have sky chart capabilities.