Slitherine Publisher sale - any gems?

I quite enjoyed Ravenmark and Legions of Steel.

I should go back to playing them someday, not sure why I stopped tbh.

I recommend Distant Worlds: Universe and Field of Glory II, those are fantastic games.
There are many more good games, but it depends on your interests which you should pick of those.

An interesting thread. I also think of buying a game. It'll be either "Mare ostvm" or "Close Combat: Last Stand Arnhem" - both look promising.

https://store.steampowered.com/app/320400/Magnifico/
Last (& only) bundled in 2015.

Battlestar Galactica Deadlock
Don't know anything about the game, but the tv show was a true masterpiece. It was one of the few tv shows for me, that could keep my interest till the end. I am still searching for something similar in terms of story, feels, immersion.

Buzz Aldrin's Space Program Manager, a gem about race to the moon between US and USSR.
Turned based management with simple probabilities. Interface at first sight looks like quite dry but space launches are animated.

Slitherine Publisher sale - any gems?

No. All of the gems, just like all of the points,already went to Gryffindor.
Memes aside, Slitherine games aren't the best reviewed, and they tend towards bundles. I wouldn't personally consider any of them worth getting at the prices of a typical store sale [though several are worth it at bundle-level discounts]. In that sense, my recommendation is to avoid any of the games with higher prices.
Edit for those requiring clarifications: "Personal" means "Personal" and does not insinuate any sort of directive towards anyone else's actions, it simply indicates the speaker's outlook regarding their own decisions. It's always beneficial to research and carefully consider the specific product you're interested in on your own and make determinations based on that research. When a statement uses vague terms like "tend", then that's likely a good indication that the point in question may require an eye for exceptions. Games "worth getting" are subjective to begin with, and even among Slitherine's "games worth getting" you'd still be hard-pressed to find a review score above 70%, which was the main point of my comment above to begin with.
That said, my original phrasing was a bit unfocused, so I did edit it to clarify an actual recommendation.

View attached image.

Pride of Nations obviously

played Aggressors: Ancient Rome a lot lately, really nice 4x game

Deals category is to inform about games or other items promotions. Not to ask "is it worth it".

So I moved this topic to off-topic category.

Pandora: First Contact is the best Alpha Centaur clone out there. Better than Civilization: Beyond Earth.