RVO2 Library is an easy-to-use C++ implementation of the optimal reciprocal collision avoidance (ORCA) formulation <http://gamma.cs.unc.edu/ORCA/> for multi-agent simulation. RVO2 Library automatically uses parallelism for computing the motion of the agents on machines with multiple processors and a compiler supporting OpenMP <http://www.openmp.org/>. Please send all bug reports to <geom@cs.unc.edu>. The authors may be contacted via: Jur van den Berg, Stephen J. Guy, Jamie Snape, Ming C. Lin, Dinesh Manocha Dept. of Computer Science 201 S. Columbia St. Frederick P. Brooks, Jr. Computer Science Bldg. Chapel Hill, N.C. 27599-3175 United States of America <http://gamma.cs.unc.edu/RVO2/>