Macaronics is a free human-based computation service whose goal is to improve machine translation, and make any text on the web available in any other language.
Macaronics lets you read full texts from their sources, unfiltered by paraphrasings and redactions, regardless of whether you are literate in the source language or not, and even if you have no desire to learn that language in the first place.
If you are a student of a particular language, though, using Macaronics will help you read and write more idiomatically, using patterns and rhythms found in text written by native speakers.
TeamWork.io is an encrypted message hub, a public bulletin board where you can post hidden messages to anyone, both individuals, or teams of people simultaneously, readable by only you and them.
It uses some of the basic ideas of public key cryptography: if you know someone's public key, you can generate a message that only they can read, and that it's also possible to encrypt a message for a specific group of people, decipherable only by members of that group.
PiScan is a personal shopping and inventory-tracking device based on the Raspberry Pi.