1)   MITCalc - Tension Springs 1.13 Geometric and strength designs of helical tension cylindrical springs loaded with static loading. Application supports Imperial and Metric units, is based on ANSI, ISO, DIN standards and support many 2D and 3D CAD systems. 2)   MITCalc - Compression Springs 1.13 Geometric and strength designs of helical compression cylindrical springs loaded with static or fatigue loading. Application supports Imperial and Metric units, is based on ANSI, ISO, DIN standards and support many 2D and 3D CAD systems. 3)   MITCalc - Torsion Springs 1.15 Geometric and strength designs of spiral cylindrical torsion springs loaded with static or cyclic loading. Application supports Imperial and Metric units, is based on ANSI, ISO, DIN standards and support many 2D and 3D CAD systems.