Mathematical Concepts and Tools.....

[1] Integral Calculator with Steps

[2] Derivative Calculator with Steps

[3] Refine your math knowledge, everything in one place with online examples.

[4] Linear programming, various methods of optimization solver.

Time-Series Data Analysis and Forecasting.....

[1] Amazing book on Kalman Filtering with interactive code example.

Amazing webtools for day to day tasks.....

[1] Free web apps including video editor and pdf tools : https://123apps.com/

[2] Free AI based tools to do anything: https://tinywow.com/

[3] AI based copy writing website: https://www.copy.ai/

[4] AI based writing assistant: https://jenni.ai/

Power and Energy System Engineering.....

[1] Collection of key concepts and calculations in Electrical Engineering.