This is more of an index to contributing to the game. Note that your solutions might not be used and it is possible for them to even be ridiculed. Please do not take offense and try to get as much constructive criticism out of it as you can. If your work does get put in, than congratulations!!
Icons, glyphs, sprites, animations... images
For an overview on spriting see our Guide to spriting.
Coding
A code overview is available as well as a guide for experienced programmers.
Mapping
A Guide to mapping is available.
Development and contribution guides
GearStation 13 is an open source project, so anyone can contribute to it. Here are a few guides to help you if you're interested in contributing.
Guide to Contributing to the Game
Setting up Git (TG13 Source Control)
Guide to working with /tg/station as an upstream repository
Downloading the Source Code
Understanding SS13 Code
SS13 for Experienced Programmers
Text Formatting
More dev guides
Helping with SS13
See Setting up git to see how to commit your code, images, map updates or anything else to the GearStation repo.