RealArcade 1.2, a free download, offers a huge selection of over 200 download games-- puzzle, word, action, Sega classics, and more. RealArcade also has features that help you acquire, play, and manage all your favorite games. RealArcade has a Game Guide for finding games that match your interests, plus a My Games feature that lets you view and organize the games in your collection. Other features include a download manager for smooth downloads, helpful automatic system-requirement checks, and secure transactions. RealArcade also includes Web-based games that run directly in your browser; and for those looking for some friendly competition, there's an online community for matching players, sharing information, and enhancing the overall gaming experience. 
FREE
Download

SolSuite 2004-Solitaire Card Game Suite 19.0 is a collection of 406 solitaire card games, featuring animated and custom cards, dozens of backgrounds, automatic play, high scores, and sounds. All your favorite games are implemented, including Spider, Klondike, FreeCell, Pyramid, Golf, Canfield, Forty Thieves, Flower Garden, and original Solitaire. Features include a Create a New Card Set wizard, multiplayer mode, and a tutor. Version 19.0 adds the following new features: now you can upload the Single Games scores for all the games with a single upload. Added several new beautiful Background bitmaps. Version 19.0 also adds two new games: Minerve, Tristan, and Isolde. 
$24.00
Download

123 Free Memory 2003 Free Memory Card Game Collection 3.1 offers five great memory card games: Ace-To-King, Concentration, Forget-Me-Not, Memory-Up (6x4), and Memory-Up (8x5) with more than 9 trillion possible games to play for each game. You can customize the card sets, decks, backgrounds, autoplay options, undo/redo options, and sound effects. In version 3.1, the game Memory-Up (8x5) has been added. 
FREE
Download

Classic Basic Games 1.0 may interest you.  Each game included in the collection is an original, un-cut classic game from the '70s and early '80s. Some of the games included are: Super Star Trek, Hamurabi, Lunar Lander, Elisa, Towers of Hanoi, Wumpus, BioRhythm, Life, Animal, ASCII Art, and many others. Many of these were published in David Ahl's Creative Computing Magazine. These games run as native windows apps via my Classic Microsoft BASIC compatible interpreter. The interpreter will run original tokenized or ASCII programs, and can be used to run any BASIC program as well as the games included in this package.
FREE
Download

The War Games Construction Kit 1.2 is a 3D interactive arcade game, play single player or networked. Enjoy flying airplanes, driving tanks, firing artillery and parachuting behind enemy lines. Build your own worlds and scenarios using the World Builder.  This major update contains network play fixes, joystick support, and all keys made re-definable.
FREE
Download

In Sonic The Hedgehog 3, a SEGA Classics title, the deranged Doctor Robotnik's Death Egg crashes into Floating Island, which happens to be powered by the very thing he needs to fix his doomsday machine, Chaos Emeralds. Sonic and Tails must now maneuver even faster through six enormous Zones to collect the gems before Dr. Robotnik gets to them and destroys this beautiful island and all of the innocent creatures. The full version features unlimited play; zones that are three times bigger; saving and revisiting levels you've already played; seven bonus stages, and the giant Gold Rings; and two-player Versus Mode as Sonic, Tails, or Knuckles.
$15.00
Download

In Automaders 1.0 the universe is under attack and it's up to you to liberate the planets. Feel the adrenaline as you fend off hordes of cyborgs, motherships, and deadly bosses. Challenge your reflexes by dodging incoming fire and diving enemies. The skies will explode with your power. This action-packed, addictive game has classic arcade-style game play. The full version features unlimited play, unique and challenging enemies, stunning graphics and sounds, tons of levels, and powerful power-ups. 
$20.00
Download

The Games Factory 1.06 is designed to provide everything you need to manufacture arcade, platform, and adventure games. It also provides the capability to create screen savers and other multimedia. It features fast screen scrolling, fade effects, ability to display FLI animations, video for Windows, and QuickTime movies.
$29.00
Download

Concentration: The Memory Games 3.0 is a full-featured memory game of the card pair flipping style that combines tradition and innovation. Played by a single player against the clock and high score table, or against human or computer opponents, improves memory and concentration during the game. It even includes tournament play for the persistent players. If you're an advanced player, try modern card flips and reveal card faces only when all members of the pair are selected, see how randomly moving and teleporting cards provide challenge for you.   Joker card and an extra bonus match card flavor the game play, just as "gravity" does. Try the Duel game mode if you want to play concentration the new way against an opponent. Download self-installing true color card sets, which come with descriptions that allow associative play. Match cards to descriptions or just let Concentration - the Memory Games display a tool tip over a card that catches your eyes. You can play with pairs that consist of two, three or four identical cards on boards that range from small to extra large. Why, it even lets you customize the games to your taste. For a registration price of US$15 registered users have the following benefits: Branding with user's name, free license for future versions, nag screen removal, enhanced boss key feature, use of shareware card sets.