Overnight Batch Render is a simple yet powerful batch rendering tool for 3dsMax, capable to process multiple scene files sequentially on a single computer.
Spline Combiner is a 3dsMax plugin for simultaneous editing of multiple spline curves, wich lets you perform boolean operations between shapes, cut and break them into parts and control curve intersections.
http://www.splinedynamics.com/overnight-batch-render/
http://www.splinedynamics.com/spline-combiner/