You couldn't move for real-time strategy games back in the day, but (Starcraft 2 aside) the genre seems to have fallen by the wayside of late, and it's not entirely clear why. Planetary Annihilation and Meridian: New World are two of the biggest names in what could be a space sim-style renaissance - just as soon as both games are released, naturally. While the former requires a £30 Early Access fee to sample its gigantic galactic tactical action, the relatively humble Meridian now has a demo, in addition to its slightly cheaper Early Access tithe. Yep: Meridian is two rare things all at once: an old-fashioned RTS, with an old-fashioned free playable demo. You can grab it from the website or from its Steam page.