Software

The Orocos Project - The Open Robot Control Software Project aims to develop an architecture-independent component based framework for all aspects of robot control. Orocos is Free Software licensed under the GNU LGPL.
http://www.orocos.org/

TeamBots - A collection of Java-based control and simulation programs for multiagent mobile robotics research developed at CMU and Georgia Tech. Full source code is included. Non-commercial use only.
http://www.cs.cmu.edu/~trb/TeamBots/

Javaclient for Player/Stage - Allows development of applications for Player/Stage using the Java programming language. The client implements all major devices described in Player manual. Free Software licensed under the GNU GPL.
http://java-player.sourceforge.net/

Player/Stage - Player is a language and platform independent network server for robot control. Stage simulates a population mobile robots in a 2D environment. Both are Free Software written in C++ and licensed under GNU GPL.
http://playerstage.sourceforge.net/

The Rossum Project - An Open Source robotics project that aims to develop standardized simulators, control software, and APIs for mobile robotics applications. All code is Free Software licensed under the GNU GPL.
http://rossum.sourceforge.net/

MissionLab - Multiagent robotics mission specification and control software. Takes high-level military-style plans and executes them with teams of real or simulated robots. MissionLab is proprietary software buy may be used at no cost in some non-commercial cases.
http://www.cc.gatech.edu/aimosaic/robot-lab/research/MissionLab/