Freeware

Cribbage Solitaire
Score as many points as possible as you work your way through a deck of cards playing six hands and five cribs. (Windows)
http://www.gamesbymax.com/cribsol.html

Folly - Solitaire game for Windows
Challenging game of solitaire for Windows with help file with rules and strategy guide
http://www.mult-sclerosis.org/Folly.html

Free Solitaire
Ten of the most popular solitaire games available to download for free, featuring large, realistic cards for high-res screens.
http://www.goodsol.com/freesol/

Loydware
Windows 95/98/2000/NT Classic Count 11 and Up and Down. Download freeware.
http://www.geocities.com/galsoft/

PySol
An open source (GNU GPL) collection of solitaire card games, written in Python.
http://www.oberhumer.com/opensource/pysol/

RekoNet
Collection of solitaire cardsets that can be used with many programs. Includes links to other cardset resources and games.
http://www.rekonet.org/

Ronda
Version of Solitaire-style game popular in Morocco.
http://sourceforge.net/projects/ronda

Solitaire Games and Photo Sets
Collection of games with hundreds of card sets for Windows or Amiga.
http://home.arcor.de/amigasolitaire/e/welcome.html

Spider Solitaire
A Windows application played entirely offline.
http://www.spider-solitaire.net/spider-solitaire-free.htm

Spider Solitaire
A gratis implementation of the Spider game.
http://www.geocities.com/spidersolitare/

1st Free Solitaire
A collection of 7 free solitaire card games for Windows, including the games Yukon, FreeCell, Klondike, Flower Garden, Monte Carlo, Bisley and Carpet.
http://www.free-solitaire-download.com/

Wiz Solitaire
A dozen solitaire games, including Klondike, FreeCell, Spider, Pyramid. Includes rules. Comes with fantasy illustrations on the faces of cards; users can make their own decks. Windows and Java versions.
http://tellini.info/software/wizsolitaire/