Multiplayer
Arrange meetings with other people to play MP, announce your servers.

Show your Creations
Post pictures and videos of your factories.
If possible, please post also the blueprints/maps of your creations!
For art/design etc. you can go to Fan Art.

Gameplay Help
Don't know how to use a machine? Looking for efficient setups? Stuck in a mission?

Bug Reports
Post your bugs and problems so we can fix them.

Ideas and Suggestions
Post your ideas and suggestions how to improve the game.
Moderator: ickputzdirwech

Mods
Here you can find mod discussions, and modders can create threads for their mods here.
You can also find spotlights or ratings here (?).

Modding Discussions
Discussions about modding and mod development.
Here you can get help if you have questions about how to program a mod, discuss your ideas with other modders, cooperate with others, suggest your ideas.

Tools
Enhance your gameplay with these tools. This category is also the right place for tools useful for modders.
Mod databases, calculators, cheatsheets, multiplayer, scripts, libs and other useful stuff that is not strictly in-game mods.