Arduino Shielded Modules

Arduino is an open-source hardware and software company, project and user community that designs and manufactures single-board microcontrollers and microcontroller kits for building digital devices.
Its products are licensed under the GNU Lesser General Public License (LGPL) or the GNU General Public License (GPL),[1] permitting the manufacture of Arduino boards and software distribution by anyone.
Arduino boards are available commercially in preassembled form or as do-it-yourself (DIY) kits.
(from https://en.wikipedia.org/wiki/Arduino)