I'm not particularly found of C-DOS Abandonware, but I do have some links that might be useful:
http://www.abandonia.com/
http://www.abandonware-paradise.org/ -> French, but got a English option and it's easy to navigate anyway
http://www.hotud.org/
http://www.freeoldies.com/index.php -> Best EVER
http://www.oldgames.sk/en/index.php
http://www.thehouseofgames.net/
http://www.abandonware-utopia.com/ -> Also French, requires sign up but it's also easy to navigate
http://www.abandonia.com/
http://www.abandonware-paradise.org/ -> French, but got a English option and it's easy to navigate anyway
http://www.hotud.org/
http://www.freeoldies.com/index.php -> Best EVER
http://www.oldgames.sk/en/index.php
http://www.thehouseofgames.net/
http://www.abandonware-utopia.com/ -> Also French, requires sign up but it's also easy to navigate