Master of Magic. Braindead AI, total lack of balance, yet such an amazing, captivating and replayable game.
Heroes series. I enjoyed all of them except 1 (too basic for me) and 6 (shit as shit can be). The perfect game to play with friends. The third one was the best.
Jagged Alliance 2. Simply put, the best tactical combat ever. And not only that, the RPG elements were also strong, mercs had much more personality than all emotionally engaging bioware NPCs combined.
Master of Orion 2. Similar to MoM, but somehow less epic and gripping.
Alpha Centauri. The best Firaxis game, Civ2, only better.
Warlords 3. Also a great multiplayer game.
Civilization 2. Fond memories.
King of the Dragon Pass. Amazing game with incredible details, ridiculously obscure.