Sadly, my boss a few weeks ago asked for an online strlen tool. We're working with a device manufacturer that has a device with a scripting language. Said scripting language has strings, but no string length function, so he needed to precompute string lengths and do additions. The device was also only accessible via a Windows client so he was doing work on a ten year old windows laptop that didn't have any development tools installed.
That's sad. Again, as mentioned above, I would have just downloaded a bunch of gnu tools for Windows (they are effectively standard on *nix), and showed him how to use wc (Word Count) to output the number of bytes or number of characters, whichever he needed.