Buildnext is a free web tool that takes your LEGO inventory (list of sets by their identification number) and calculates the list of LEGO sets you can build with a link to rebrickable.com. Most sets have downloadable instructions either directly on rebrickable.com or on one of the other popular sites (such as bricklink.com, brickset.com, or brickowl.com). Hopefully, this tool will give you even more hours of fun with your LEGO and kids.
