warzone2100 VS endless-sky

It is more an RTS than a 'classical' wargame, but you could do it in Warzone 2100. It is old for now (but it was very fun in 2000s). It could be fun for you today. There is a free and open source version : https://wz2100.net/ .

It's free at wz2100.net and it's tiny, mere megabytes.

There is also Warzone 2100 as a freeware RTS if you want something else to play https://wz2100.net/

I never had any problems running it on mine, but Warzone is a very old game. Are you using the latest version? https://wz2100.net/

Warzone 2100

https://wz2100.net the best free and open-source rts ever. Optimised apple silicon processors

Sounds very similar to Endless Sky[1] - another open source game drawing on the old Escape Velocity games. I really enjoyed both Endless Sky and the Escape Velocity games, so I'll have to check out Naev at some point!

[1] https://endless-sky.github.io/

There's an open source successor to Escape Velocity that's fun and continues to grow:

https://github.com/endless-sky/endless-sky

#2 - Endless Sky - ALSO inspired by Escape Velocity, but IMO this is more polished Escape Velocity clone and could reasonably be called the modern successor. EXCELLENT space trade/piracy/combat and definitely take some good strategy to get far into the game.

From the changelog

Bottom left of the website has discord invite link https://endless-sky.github.io