My last weekend's project: A service that allows you to drop an encrypted note. You will receive a link to the note that is valid exactly once: While accessing the note it gets removed from the machine immediately. The note itself gets encrypted on client side so that no note is transmitted unencrypted and the password has not to leave the browser window. To decrypt the note you need the link and the password (an empty string is a valid password). I tried to keep everything as minimalistic as possible. No fancy frontend framework, no fancy backend database, only express on node.js for the API and webserver for the web UI. The project is shared on github: https://github.com/dextreem/one-time-note
Feel free to have a look and deploy wherever you want if you think you can make use of it. Comments and critics are welcome :)