I'm not sure where to put this, since it's not really "classic computing" but Flash is dead and I suspect browsers will drop support before long. This is an important part of the early web but doesn't get the same level of attention as old consoles and arcade games.
Gigs and gigs of Flash (and similar tech like Silverlight and Shockwave) games, zipped into one giant standalone download. I'm tempted to grab it now, just in case it disappears, because it's chock full of licensed characters, ripoffs, pornography, and everything else you remember from places like Newgrounds. Full list of contents