YunoHost is an operating system aiming for the simplest and user friendly administration of a server, and therefore democratize self-hosting, while making sure it stays reliable, secure, ethical and lightweight. It is a copylefted libre software project maintained exclusively by volunteers. Technically, it can be seen as a distribution based on Debian GNU/Linux and can be installed on many kinds of hardware.
With Yunohost communities can self-host their digital services: web, mail, chat, cloud… using affordable single board computers like Raspberry Pi or Olimex. It can be hooked to the internet or local mesh networks in the case of remote areas.