1)   Engineering Power Tools 1.9.8
ENGINEERING POWER TOOLS solves a wide variety of common engineering problems quickly and easily. Over 70 programs and data tables integrated into one easy-to-use package. Categories include Math, HVAC, Mechanical, Electrical, Materials & Structural.

 2)   S3Dfree 2000 6
S3Dfree 2000 is the FREE unregistered version of Solid3D. Solid3D Fastener library is a productivity tool for AutoCAD allows you to create solid models of assorted Nuts, Bolts, Screws and Washers.

 3)   ShapeBook with 2D3DSteel 3.10
A structural steel reference and AutoCAD drafting tool for steel construction. View dimensions and properties. Search shapes by property values. Convert shape lists between US and metric. Based on AISC Manual of Steel Construction LRFD Third Edition.

 4)   FrameMaster 3.1
FrameMaster is a FEM-program that helps you dimension almost all kinds of constructions: roof-trusses, floors, walls, bridges,furniture, shafts and much much more. FrameMaster is both one of the cheapest and most powerful program in its category.

 5)   MATruss 1.2
MATruss performs static strength analysis of a structure made up by truss elements. A thoroughly tested and reliable solver analyses the truss model and produces the data needed for design.