Foreman is a mod for managing blueprints in game. You can manage a list of blueprints in your save game, export them to text and import blueprints others have shared. Multiplayer support has been removed as it was too buggy.
If you are updating to 0.11.3 you might see “Unknown key…” on the buttons (like so). If this happens please unzip the mod and use the folder instead. I am not sure what is causing this issue as it does not happen for me.