• NMR Solvent Peak Locations

https://nmrpeaks.com/

• Online Integral Calculator

https://www.wolframalpha.com/calculators/integral-calculator/

• NIST reference on fundamental constant 

https://physics.nist.gov/cuu/Constants/factorlist.html

• PolymathPlus Math Solver

Download Polymath by Polymath Software (informer.com) 

https://winter.group.shef.ac.uk/