LDCad offers fast and realistic rendering in unlimited split views.
Use stepping and submodels to create user friendly building instructions for all kinds of models.
The fully interactive LDraw source window can be used to reorganize content in preparation for e.g. (external) building booklet generating.
Use fully integrated flexible parts to create things like pneumatic hoses, rubber bands and springs.
The main interface layout can be fully customized by (un)docking, adding, removing and resizing needed subwindows.