Divisions by zero

It's a tiny bit entrepreneur-brained, but seems pretty cool regardless. You can choose several paths, from passenger transportation to cargo to piracy to mercenary work. Lots of user contributed lore and all sorts of shit going on. You start with a small ship and an odious loan and try to build up an entire fleet. I've only scratched the surface so far, but it seems like a pretty neat rabbit hole.

Endless Sky is an open source space merchant game with space battles, a huge amount of ships and variety, dozens of alien species, multiple storylines, and so much more. I think my favorite part is how accessible it is to contribute to the game; most things like storylines, quests, and ship outfits can be added or modified with a simple text file. Saves are also plain text files, and can be edited, exported, and imported. There are also tools for creating sprites and the game actively encourages mods, which they call plugins. It's such a deep and complex game already, and only one storyline is actually complete. It's available on steam, and a mobile port for Android exists on f-droid

Endless Sky is a 2D space trading and combat game similar to the classic Escape Velocity series. Explore other star systems. Earn money by trading, carrying passengers, or completing missions. Use your earnings to buy a better ship or to upgrade the weapons and engines on your current one. Blow up pirates. Take sides in a civil war. Or leave human space behind and hope to find friendly aliens whose culture is more civilized than your own.