I'm a front-end web developer located in Moscow, Russia. I'm also interested in photography. That is why the first software project I've ever worked on was my own website: http://kremer.pro.
Here is my project for students: http://naeplagi.at. It is a plagiarism detectors hack, currently working via putting hidden text in the document.
If you know about any such services used in your location, please let me know: email@example.com.