1)   MITCalc - Compression Springs 1.17
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.
Spring, springs, cylindrical spring, compression spring, helical spring, EN 13906-1, DIN 2089-1, DIN 2095, static strength check, dynamic strength check,

 2)   MITCalc - Springs - 15 types 1.14
Geometric and strength designs of 15 springs types. Application supports Imperial and Metric units, is based on ANSI, ISO, DIN standards.
Spring, springs, cylindrical spring, compression spring, helical spring, conical springs, spiral springs, belleville, torsion bar springs, leaf springs,