Good question! Abaqus also has 3-node truss elements and describes them this way:
The 3-node truss element available in Abaqus/Standard is often useful for modeling curved reinforcing cables in structures, such as prestressed tendons in reinforced concrete or long slender pipelines used in the off-shore industry.
So you could try modeling cable sag with it, but it may not work 100% correctly in CalculiX: Simulation of cables with tension-only materials