Freetz: AVM Fritz!Box firmware extension
You might heard about OpenWRT, the open source firmware for Linksys WRT54GL Device and capable devices.
Freetz [1] is a firmware-extension (modification) for the AVM Fritz!Box [2] and devices with identical hardware. The original firmware from the manufacturer is extended with new functions and programs which may be selected by the user. Freetz is free software and is developed by Oliver Metz, Alexander Kriegisch and others.
Freetz is free software licensed under GPL. I heard of if it in the CRE 102 – Der Dect Hack – Podcast (German), in which german Hackers talked about how (in)secure Dect is, how the Dect works and about the AVM FRITZ!Box device, in which Dect is integrated.
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Can I get a finished binary of Freetz?
The short answer is no, and this is never likely to be possible. Freetz works by taking the original firmware and applying patches to it. Since the original firmwares contain software which is non-free, as well as some which is free, then we are not able to distribute finished binary versions. Given the number of permutations of modules and hardware then it would be impossible to meet all needs with a limited number of binaries and so is actually better to have users make their own firmwares.
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[1] http://www.freetz.org/
[2] http://www.avm.de/de/Produkte/FRITZBox/FRITZ_Box_Fon_WLAN_7270/