LINE is an open-source software package to analyze queueing models via analytical methods and simulation. The solver is available for MATLAB, Java (alpha version) and Python (alpha version). LINE features algorithms for the solution of open queueing systems (e.g., M/M/1, M/M/k, M/G/1, ...), open and closed queueing networks, and layered queueing networks. Additional details are available on the project website: http://line-solver.sf.net.