Turn-based tactics (TBT) DOS games you can play online, free in your browser. All 6 titles here start instantly, with nothing to install.
They span 1994 to 1997 and lean towards strategy / tactics.
Empire II: The Art of War1995 · Strategy / tactics
Jagged Alliance1995 · Strategy / tactics5.0
Steel Panthers III: Brigade Command - 1939-19991997 · Strategy / tactics
X-COM: Apocalypse1997 · Strategy / tactics
X-COM: Terror from the Deep1995 · Strategy / tactics
X-COM: UFO Defense1994 · Strategy / tactics