Well today's tip is a new one, even for me! Thanks to a tip from Matt Wise I recently discovered something called DevToys! As they describe it: a swiss army knife for developers.
Indeed DevToys (small footprint, open source) is a joy for us developers. It contains all kinds of things that I would normally have to do a Google search for first, things like Base64 en/decoding, JSON formatting, generating Lorem Ipsum text, testing regex, etc.