Old page of Little Fighter with the original game download intact (Wayback Machine):
http://home.netfront.net/~marti/lf2/lf1.html

Monika's Tic Tac Toe

Back in 2005, when i was just 14, i made this game:
Mission Possible: Killers Base
https://webzone.ee/mispos/

The game itself is in Estonian, but it's an easy game that should be well playable to everybody even without any instructions.
Though, check the instructions for keys. It plays almost identically to Counter Strike 2D, that was somewhat popular during that time as well... The sounds are even taken from it. 😁

Invader Alien -- a nice faux 3D perspective shoot 'em up created with DIV Games Studio.

RevoTron, a freeware 3D Tron clone from 2003/2004. Played the hell out of this back in the day.

The website is still up and also hosts the source code for Visual C++6.0:
https://revotron.tripod.com/download.htm

I've just been notified of an obscure Finnish game called The Great Mystery of Cheops which has been liberated by its author:
https://kasettilamerit.fi/kheops-suuri-mysteeri-pc-dos/

Apparently, the author first developer it in English, but then switched to Finnish to target the domestic market (the game was sold commercially). The English version remained unreleased back then, but for the freeware release, it was updated with the extra content found in the Finnish version.

A selection of modern DOS games made for a competition:
https://www.high-voltage.cz/2017/soutez-tvorb … os-2017-anketa/

A few more modern DOS titles at itch.io (part of DOS Game Jam):
https://itch.io/c/443894/modern-dos-games

UPD: A couple more small DOS games:
https://wej.k.vu/games/dos-games/

The Legend of Talibah -- a top-down RPG with some very nice art, apparently never completed.

Haven't checked them out yet but these racing games seem nice (found at Reloaded.org):
Victory Road
Road Fighter Remake

A few more findings, these are for DOS:
Jumpball
Final Soccer Challenge
WackyBrit Pong
Top Hat Willy
Raymond Fait Du Kart