This is the code for POSEIDON, a fishery agent-based model; currently under review but open-source under GPL. For all intents and purposes please consider this code pre-alpha.
A good run-down of what it is and does is available here: http://carrknight.github.io/poseidon/appendix.html
This is a simple gradle project. As long as you have an updated version of java on your computer you can just type in the terminal
./gradlew run
and it will download libraries, compile sources and run the program. If you are not on linux/mac you just use gradle.bat instead.
Most IDEs should be able to open the project just by reading the build.gradle file.
A full fledged tutorial for this project is available here