Map Making Tools Worldbuilding. Tavern Generator - Everything you need to make a tavern on the fly. A true galaxy map must map hundreds of billions of stars and quadrillions if not more planets asteroids nebula etc etc.
The following map took me less than 30 seconds using Windows Paint. Also supports Sci-Fi assets. You can just use auto-generated maps or create your own world from scratch.
World Anvil is a set of worldbuilding tools that helps you create organize and store your world setting.
Also supports Sci-Fi assets. Desktop application Electron is available for Windows Mac and Linux. The MilkywayHome project is a ginormous effort just to map our own galaxy. This month on Fictorians were talking tools with a focus this week on worldbuilding.