Newnigma2 is an operating system based on Linux for
satellite receivers / set-top boxes developed by Dream.

Evolution

OpenEmbedded (OE) is the underlying framework of the base system.

Enigma2 is the main application for satellite receiver related features like
handling the channel list, showing the electronic program guide (EPG), etc.

Firmware

Yadi

Yet another dbox2 image
(listed for historical reasons)
http://dboxjffs2.sourceforge.net/

openATV

The first version of openATV was based on OE1.6.
This firmware runs on hardware of other brands too.
https://www.opena.tv/

opendreambox (DreamOS)

This is the official firmware for the Dreambox.
Since version 2.5, opendreambox is also called DreamOS.
https://dreamboxupdate.com/
https://github.com/opendreambox/

newnigma2

https://newnigma2.to/

Hardware

Dreambox

https://dreambox.de/