Some games I like:
The first game from the series I have played, it remains my favorite until this day.
I play it on Linux thanks to the amazing openMW project
CK2 is a special game. It's often labeled as a grand strategy, but I prefer to call it an RPG masquerading as a strategy game. Unlike a typical strategy game it's centered around characters, not factions or nations.
The 5th installment of perhaps the most famous strategy game series of all time.
An interesting tactical game. The randomness is a little annoying to me though so I modded it to have 100% hit chance, fixed damage, and cover that provides 100% protection.
This is one of the best guide videos ever.
This is a fascinating game that combines simple yet deep strategy with negotiation.
You can play it online for free here.