Space Sim - LibreCosmos

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the free operating system for mission control and spacecraft.
Version: 0.4.0

Imagine you are an operator at mission control. Out there, robotic spacecraft orbit the Earth and the Moon, and the only way to reach them is an ansible link to their onboard Linux. No joystick, no cockpit - you fly them with commands:

operator@mc> connect kestrel # open the ansible link to your ship

operator@kestrel> target tsiolkovsky # the station you are flying to

operator@kestrel> nav transfer tsiolkovsky # plan the burn that gets you there

operator@kestrel> alarm ap # wake me up at the highest point

operator@kestrel> burn prograde 5.65 # fire the main engine

operator@kestrel> systemctl enable --now scanner # power up the surface scanner

operator@kestrel> cat /data/scan-moon.txt # read what it found

operator@kestrel> at pe -30s burn retrograde 412 # schedule a burn for later

Real orbital mechanics, a ship made of modules that run as services, files, jobs, alarms and mail - and missions that take you from a parking orbit to the Moon and beyond.

Don't wait - your first mission is ready for launch

>_ terminalThe classic ansible terminal: keyboard only, braille map, RCS mode. For those at home in a shell. ◎ graphicalWireframe map, status panels and tool buttons that type the commands for you. Best for a first flight.

Both versions share the same operators and campaigns, saved in this browser. Switch any time with ui gui or ui tui.

LibreCosmos is a hobby project, free and without ads. If you enjoy it, and you want to support further development you can buy me a coffee:

How to start

Create your operator: useradd <your name>, then name your first ship (or press Enter for Kestrel).
Open the link to it: connect kestrel. The briefing of your first mission appears.
Follow the hints: each step suggests the next command and says why. Press F4 (or click a $ line in the graphical version) to put it on the command line, then Enter.
Lost? hint repeats the current step, mission shows the objectives, help lists the commands and man start explains the game. Tab completes, F1 lists the keys.
Time is yours: time x100 speeds it up, alarms and events bring it back. save before a tricky maneuver, restore if it goes wrong.