Webplot digitizer: https://automeris.io/WebPlotDigitizer/
Online tool to digitize graphs and figures, allowing to quickly get 'raw' data from a plot in a paper/slides
Energy units conversion: http://halas.rice.edu/conversions
eV <-> nm <-> cm^(-1)
Citation style editor: https://editor.citationstyles.org/
Find, edit and download citation styles
Color palette: https://paletton.com/#uid=1000u0kllllaFw0g0qFqFg0w0aF
Color choice tool
RP photonics encyclopedia: https://www.rp-photonics.com/encyclopedia.html
Introduction articles for optics/photonics topics
Pulse tool: http://www.calctool.org/CALC/phys/optics/pulsed_source
Quick optical pulse calculator
NIST XPS database: https://srdata.nist.gov/xps/main_search_menu.aspx
What is that XPS peak?
Poisson calculator: https://stattrek.com/online-calculator/poisson.aspx
Quickly evaluate Poisson statistics. Average rate of success = <N>
CalTOPO: https://caltopo.com/
Nice US topo maps