Since the sequel has been officially announced and apparently no one has heard of, let alone played this, I made this nice thread for it.
Now take your minds back to 2004, it was a dark time indeed, the home consoles were eating PC gaming's lunch and the future looked gloomier than ever. But not all hope was lost, a few still braved the stormy markets and made sophisticated PC games to rival the best the consoles had to offer. Once such company was the Hungarian Mithis Entertainment.
Nexus was everything a space RTS should be and more. Instead of focusing on large fleets and hectic action like Homeworld, it took the more tactical approach of giving you a few ships with customization and much more tactical combat. It features individual weapon control, targeting a wide variety of subsystems, power management, boarding parties, drone fighters/bombers, layered shields and much much more. Most importantly it has a pause feature, which lets you take your time when making decisions instead of the hectic hotkey mashing you get in most RTSs.
Here is the most decent gameplay footage I could find. Nexus the Jupiter Incident is available on Steam for $10 and unfortunately not on GOG.