LARA subprojects are usually available as .jar files containing the source code. If it's more convenient for you to fork (the latest source code) on bitbucket, the links are provided as well. Stable releases are also available from sourceforge via SVN. If you checked out the code, make sure to disconnect your project since you do not have write permissions anyway.
Core components. Minimum requirement for LARA models. Distributed as a .jar file containing the source code.
Additional tools. Recommended for LARA models. Distributed as a .jar file containing the source code.
Simple example model. Described in "Social-ecological modelling with LARA: A psychologically well-founded lightweight agent architecture" (PDF-Download). The .zip file contains a full Eclipse project with all dependencies (Base, Toolbox etc).