Link To Hyperlink
Convert links / URLs to Hyperlinks so that those are clickable as well as you can use Right Click and Save As...
Pick Color with various kinds of color pickers. Multiple options to choose color in HTML format are available.
Visually appealing simple calculator! can be used with mouse or keyboard
APR to APY
Convert Annual Percent Rate to Annual Percent Yield based on various compounding methods ranging from daily to yearly