AbandonCreations - Download site with screenshots and reviews.
Abandonia - Site is dedicated to abandoned DOS games, including many popular and classic games, neatly sorted.
AbandonSoft - Information and multiple screenshots for all games.
Abandonware: 1986 - This site contains miscellaneous games from the early eighties, when the computer gaming industry really took off.
Abandonware Online - Large directory of abandonware games available for download. Each game is introduced with a brief description, release info, cover shots and screen shots.
Classic PC Games - Abandonware database and game downloads where you can become an editor of your favourite game.
The Good Old Days - Includes, in depth reviews along with screenshots for multiple systems.
HolyFile - Provides a selection of abandonware for download. Also offers newer software.
Kevs Classic Games - Games, applications and some extras like a jokes section.
MSX Utilities - MSX-specific utilities written by Oleg Alferov, in the period of 1988-1995. Image/sprite/text editors, some action games and visual effects, the Game of Life, programming etudes.
OK Games - Old abandonware games with cheats, manuals and walkthroughs.
XTC Abandonware - Site with around 1000 oldies free for download, with an easy search on the site.