Tablify
I keep running into data that is almost in the shape I need: IP:port lists, one value per line, comma-separated values, or a block copied out of a spreadsheet. The conversion is trivial, but doing it repeatedly is annoying.
Tablify is my answer to that little formatting detour. Paste the values, choose the number of columns, and turn the result into something that can go straight into Excel, Word, CSV, or a custom-delimited format.
The important part for me is that it stays simple and local: there is no backend, no account, and the input never needs to leave the browser.