Unknown Horizons

The description of Unknown Horizons from it's official page describes the project very well:

A 2D realtime strategy simulation with an emphasis on economy and city building. Expand your small settlement to a strong and wealthy colony, collect taxes and supply your inhabitants with valuable goods. Increase your power with a well balanced economy and with strategic trade and diplomacy. 

The game certainly lives up to that and I can attest that it is really fun to play. The game recently got a new release called 2019.1, which follows up from the gigantic release made in 2017. I've been following the progess of development and have been impressed by how much that has been done with this game during the last few years. This new release has, among other things, an isometric mini-map that shows the same rotation as the main game view and ambient objects that makes the world more varied and nicer to look at. There are of course also many internal improvements and fixes of all kinds. A great time to give this excellent game a go!

A nice little settlement in Unknown Horizons.

FAR Colony

FAR Colony is a space strategy game that can be played both in realtime or in a turn based fashion, depending on what the player prefers. It's complex and in-depth game where lots of thought has got into every part. I have mentioned it a few times before, but it was quite a while ago now so I thought it deserved a heads-up. Development still seems very active, with something new almost every week. If you are looking for a really grand space strategy game, this might be where to look!

An overview of a settlement in FAR Colony, showing a Nuclear Fission Reactor.

Wyrmsun - 3.5

Wyrmsun keeps up the regular releases, this time with a winter theme. This classic-styled RTS now has seasons that passes as the game goes on, making this a winter-release in more ways than one. Seasons change the terrain and the day/night cycle, adding new aspects to this tactical game. As always there is a ton of other changes too, so make sure to check this excellent title out.

Wyrmsun showing a small settlement in winter.

The Legend of Edgar

I just noticed that I have completely missed to mention the nice metroidvania-like platformer The Legend of Edgar here! This exploration-focused 2D platformer with huge persistent levels, boss battles, several weapons to wield, etc. is really well made and also has the benefit of being complete, with story and all! Also you can play with a gamepad, which I always find is a big plus.

Edgar with sword in hand on his epic quest.

0 A.D. - Alpha 23 Re-release

Hasn't Alpha 23 of the impressive 3D RTS 0 A.D. already been released? It has, but now it's been re-released with several bugs and other maintenance-related things fixed. Many improvements has been made to online play and security and there are also a few other fixes. If you play this game an update is recommended while waiting for a new feature-release.

A battle at sea in 0 A.D. Notice the beautiful water!

SuperTux - 0.6.0

Legendary platformer SuperTux has got a huge update called 0.6.0. Since it was some time since the last one, there are loads of new things included. The Ice and Forest worlds has got a complete redesign, graphics have been updated and effects have been added, the rendering engine has been improved which means the game will perform better, etc, etc. This is a very fun game with lots of content, well worth it for fans of the genre.

An underground level with cool light effects in SuperTux.

Open Fodder

Open Fodder is simply put an open source clone of the game Cannon Fodder. As with most similar remakes you will need the original data files to play, and because I don't have them I can't say how far the project has come. But it seems to be rather complete juding from the screenshots and available information, even having support for several different campaigns from various versions of the game, so fans of this classic ought to check it out.