I'm slightly ashamed to say that I found this as a trending topic on Facebook, but whatever. Here's a link to the story:
http://time.com/3656635/play-oregon-trail-ms-dos-games-free/
To paraphrase: "The Internet Archive, perhaps best known for the website 'The Wayback Machine,' has put nearly 2,400 old MS-DOS games online. These games are available to play for free via most internet browsers."
DOS had largely gone to the wayside in favor of GUI's by the time I began using computers, so most of these titles don't mean much to me. However, it will still be fun going through the library of games to see which ones I do have memories with.
Additionally, I'm unsure as to how this works from a legal perspective. I'm guessing that the original developers (or those companies that bought them out) still own the rights to at least a large portion of these games, so maybe someone with more knowledge of this area can provide some insight.