When the terms architectural, engineering, and construction are mentioned regarding design software, one name comes to mind: AutoDesk. They company has made available some pretty amazing software for Android, like AutoCAD, SketchBook, Inventor Publisher, and Design Review. Now, it has released its popular three-dimensional engineering software ForceEffect to the Play Store.

ForceEffect offers some very nice features:

• Freehand sketching of elements and construction lines with snaps, constraints, and inferencing
• Object dimensioning, global scaling, units, constraints
• Import image as background
• Create joints (welded, pinned)
• Break element at joints
• Create supports (fixed, grounded, sliding)
• Create loads (known, unknown, distributed) and moments
• Add weight to individual elements
• Compute reaction forces and moments for equilibrium and over-constrained systems
• Toggle forces to show force vector components
• Results reporting with picture, results, all equations
• Save and load files from Autodesk 360
• In app tutorials

Best of all, it's completely free, so even if it looks like something you'd just like to play with, you're not spending a penny to give it a shot.