This is a handy tool to merge multiple LiDAR files into one. However, we usually discourage this practice as this can also be achieved on-the-fly with the ‘-merged’ option in any of the other LAStools without creating a second copy on disk. In addition this tools allows splitting larger files into smaller subsets each containing a user-specified number of points. This tool is 100% open source LGPL. For more details see the README file