As provided by Adrian Millet:
 
  SAGE 4001 Checkers Program.

SAGE 4001 is a new version of SAGE DRAUGHTS - a top notch Windows
based checkers program. It plays ENGLISH/ITALIAN draughts, and comes
with FREE DOS versions of SAGE-3100, BLITZ DRAUGHTS, DYNAMO PRO, 
(plays the 10x10, pool, spanish, russian, canadian and brazilian game
- new version with picture icons & PDN file support)
CHECKER KIT (A simple checkers program in QBASIC with source code) 
FLIP-IT (an unusual othello game) and a selection of other interesting
PCS games, all for $59 or 37 pounds.

SAGE4001 is out now! It looks really good, with 256 colour graphics,
picture-button controls for most functions, sprite animation, separate 
move-list analysis/clock/board windows (resizable) game 
comments/annotation, draughts true-type fonts for board - printing, 
powerful opening book-database which can contain set-up positions and 
auto-find transpositions (& sides-reversed pos). If you want to
improve the book, a simple add-line-to-book function exists,
and the ability to mark each move ?,<,=,>,! (weak to strong,
5 grades).
It can  automatically analyse complete games move-by-move, saving the
results in a text file. It can analyse sets of EPD positions,
again posting the results (best line, eval) to a file.
SAGE supports PDN (Portable Draughts Notation) Database format - 
a new way to annotate/store large numbers of games via simple
text files. Analysis (bestline/eval) can be spooled to a txt file
while you play. Tournement style White/Black clocks are give,
together with ability to set play-level in secs/move or x moves
in x time.. Multi-lingual support is built in.
All functions are implemented with a terrific user interface
- most are available with a simple mouse-click on a picture-icon
button.
Yet despite its powerful features, SAGE is simple for beginners
to use - just install, then use the mouse to pick up pieces and
start playing - then use the advanced features as and when you 
gain confidence.
Playing strength is substantially improved over older versions -
SAGE recently won the SamCohen event, and has a good track
record against the worlds top players.
  SAGE plays both English and Italian draughts up to Master strength, 
and costs 37 pounds or $59 US fully inclusive. 
SAGE 4001 will run under Windows 3.1, Win95 and compatibles, on
a 386/486/Pentium computer with 4 megabytes or more of RAM
and a Hard disk with 2-4 megabytes free. The DOS versions supplied
will also run on lesser PC's.
PC SOLUTIONS: PO BOX 954, BOURNEMOUTH BH7 6YJ, ENGLAND
EMAIL:  100646.3501@compuserve.com 
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  INTERNET SITES for demo versions of SAGE/DYNAMO/BLITZ
  (Chinook WWW draughts page)
http://web.cs.ualberta.ca/~chinook
  (FTP site- maybe moved to another dir..)
ftp.onenet.net:/pub/chess/uploads/dynas80f.zip 
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IMPROVEMENTS OVER SAGE 4000 - 

Improved list-box browser for PDN databases - shows 1-line per game
summary, with white/black players, comment, result, year and
first few moves - just scroll up/down using cursor or mouse on scroll-
bar, then double click on the game you want. You can search for games
with particular players, comments or even enter a board-position and
find all games that transpose into it! Fantastically useful - 
ie. find all games that open 11-15, 22-18 at a click of a button!
Comes with example 400 game database.

Much improved playing power - better hashing and other tuning yields 
much stonger performance than S4000 in mid/end game positions - 
aside from advances in endgame database. 
A recent test against a top Italian master
hint at a very large advance in ELO performance.

Can use the Chinook 5 piece endgame DB for english checkers - 
instant knowledge on 30,000,000 endgame positions!
just put the files "DB5" and "DB5.IDX" into the WSAGE directory.
SAGE uses the database in its search engine "on the fly"..
You can download the database with demo from the Chinook WWW site, 
if you like.

Multi-line analysis option - enlarge the search window to show previous
analysis, scrolling up as SAGE finds new best-lines.

Automatic "analysis to comments" option - when enabled, saves 
"best line of play & evaluation" as a game-move comment, to review
later at leisure.

New "hash-table" opening book - put positions and evaluations directly
into SAGE's hash tables - unlike a "static" opening book, SAGE will
access this information "on the fly". Uses a text file "HASHOP1.DPD"
- a DPD file is the checkers equivalent of a chess EPD file.


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Just a note - I have posted these files to the FTP site:
  FTP.ONENET.NET   directory   PUB\CHESS\UPLOADS

DB5CHECK.ZIP     // Chinook 5 piece endgame db for checkers (150,000,000 pos)
DB5CHECK.TXT     // instructions..
DB4ITAL.ZIP      // New endgame db for ITALIAN checkers, gen by Jon Schaeffer
DB4ITAL.TXT      // details..

These can be used with the latest SAGE4001, or with the C-source demo I have
posted to the same site, also see Jons Chinook WWW page.
I may have not sent these files to everyone getting "free" upgrades from s4000,
so you may need to download them for maximum performance from SAGE.