Aspen HYSYS - Aspen HYSYS is a software solution for chemical process simulation and modeling.
PTC Mathcad - PTC Mathcad PTC Mathcad is Engineering Math Software That Allows You to Perform, Analyze, and Share Your Most Vital Calculations.
myQuorum - myQuorum, a program for modeling and simulating chemical reactions, designed to help chemical process engineers and students work on chemical process modeling, simulation and optimization projects within a user-friendly environment.
SMath Studio - Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.
Surfer - Surf News, Fantasy Surfer, Photos, Video and Forecasting.
EngineeringPaper.xyz - Online app for engineering calculations. Solves systems of equations, checks and converts units automatically, supports plotting, and allows for the creation of a link to share your work. Free and open source, no registration required.