There is a lot of useful, funny and interesting information about your rabbit on the world wide web. You want to know all about your Karotz, even how it looks inside? Take a look at these links!

Rooting a Karotz

http://epicmonkey.livejournal.com/40052.html or http://epicmonkey.org/karotz/rooting.html
Ultimate guide bricking a Karotz. I think this was the main source for rooting a Karotz, other sites often point to this one.

http://wizz-cc.blogspot.nl/2012/09/karotz-system-update.html
Great (French but with translator) source for all the info you need to root your Karotz. Including a lot of technical info, sources, rooted firmware and other stuff.

http://openrabbit.conzi.com
German site with useful information (also theory), good explanation and steps to create a bootable USB key for root telnet access and more.

http://www.journaldulapin.com/2013/02/19/rooter-karotz-le-lapin-wi-fi/
Another French webpage about rooting a Karotz. With links to Wizz.cc firmware files.

http://blog.hupstream.com/en/2013/06/25/lets-play-with-karotz/
More tech info about rooting a Karotz.

Open Karotz

http://www.openkarotz.org
The main source (in French) for Open Karotz.

http://karotz.mikey-life.com
Create an account and get lots of apps for your Karotz running Open Karotz.

https://github.com/vincent-lwt/OpenKarotz-Control
Bootstrap based interface for a Karotz running Open Karotz.

Modding Karotz hardware

http://www.nicolas-sanagustin.fr/index.php/2015/02/28/dissection-de-lapin/
Look what is inside of your rabbit. Complete dissection of a Karotz. Click on the pictures to see all the details.

http://www.engadget.com/2011/08/05/nabaztag-successor-karotz-cracked-open-by-the-fcc/
Another look inside your rabbit.

http://thinkl33t.co.uk/zombunny-part-one/
Guy that took his Nabaztag (Karotz ancestor) apart and wants to replace the controller with a Raspberry Pi (not finished yet).

http://www.instructables.com/id/Hack-the-Nabaztag/
Hack the Nabaztag. Instructables. Girl who replaced the controller in her Nabaztag with a Teensy, including making the ears working again.

http://openrabbit.conzi.com/doku.php?id=openrabbit:hardware_hack
Create a serial console to get low level access to your Karotz.

http://nabaztag.forumactif.fr/t14938-tuto-ajouter-une-sortie-audio-sur-le-karotz
Add an audio output jack to your Karotz (in French).

People and business

https://fr.linkedin.com/in/yoannsculo
LinkedIn profile of Yoann Sculo, one of the Mindscape developers that worked on the Linux software of Karotz.

http://formerinternetofthings.tumblr.com/post/104479606439/originally-launched-on-the-market-in-2005-under/
Announcement of the end of Karotz on a website where you can find more Internet-Of-Things no longer with us. 

Software

http://www.busybox.net/about.html
Information about BusyBox, the heart of your Karotz (Linux) commands. BusyBox is the Swiss Army Knife of Embedded Linux.

Hardware

http://www.journaldulapin.com/2014/12/02/karotz-et-ethernet/
French information about Karotz compatible USB Ethernet modules.

http://play.with.free.fr/index.php/adaptateur-ethernet-compatible-pour-karotz/
More info about a Karotz compatible Ethernet module.

Forum

https://plus.google.com/communities/102768859832410533323
A Google Plus community of Karotz

http://www.touteladomotique.com/forum/viewtopic.php?f=48&t=11661
Forumpost started by the creator of Open Karotz.

http://nabaztag.forumactif.fr/f86-le-monde-de-karotz
Another forum where there is still some recent activity about Karotz.

Wiki

https://en.wikipedia.org/wiki/Nabaztag
Information on Wikipedia about Nabaztag and Karotz (version 3 of Nabaztag).