This is one of my favorite websites...all the info you might want about elements, in a great interactive format

This is a link to my favorite color picker website, helpful for making plots and getting the hash number of colors. The page is maintained by U of Washington.

Super neat to see which satellites are in orbit at a given time

Useful web app to get data from a plot

This web app allows for comparing blocks of text to find differences. Useful for comparing versions of manuscripts or versions of code. Desktop app for this functionality is called 'FileMerge' (at least for mac). There are command-line codes to do this function but I find the user interface better on the web app and FileMerge

This tool is helpful for cleaning up bibtex files (removing duplicates, alphabetizing, etc.)