Let's start with a fact: not every old game is abandoned. With the resurgence of "vintage", there's a renewed interest in all things retro, including videogames. As a direct consequence, a few companies acquired entire back catalogs of old games and started selling them. That's why lots of interesting games on Abandonware DOS are marked "NOT abandonware": they are sold somewhere online.
Games demo versions are a thing of the past. You don't see often demos of recent games on Steam or GOG, but the demo version of a game, in the late 80s and the 90s, was quite common, expecially when videogame magazines started to include floppy disks or CDs and internet was almost non-existent.
With this premise, I started to collect old games demos and I'm putting them online on Abandonware DOS with the focus on commercial games. Enjoy!