Especially for Ubuntu:
Component catalog - Canonical certified manufacturer list of specific hardware
Ubuntu-certified hardware - Certified models of computer manufacturers, and partly instructions to install
Free Software Drivers -(outdated) Various hardware manufacturer rated on a scale of 1-10, how good works cooperation in free Linux drivers in practice as appropriate.
Hardware Linux in general
Linux HCL - Hardware database, which according to various criteria (eg Ubuntu) scans and in a separate review can be set.
The rankings are mostly more information on whether a device is operating, and if so, under what version of Ubuntu and at what cost.
h-node - the Free Software Foundation maintains a database with more hardware that supports GNU / Linux
DebianON is an effort to document how to install, configure and use Debian on some specific hardware. Therefore potential buyers would know if that hardware is supported and owner would know how get the best out of that hardware.
TuxMobil.org - TuxMobil is dedicated to Linux and Mobile Computers.
Linux on Laptops - Reports on running Linux on notebook or laptop computers
ThinkWiki - specially for IBM Thinkpads
Open Printing - Printer-Database (Linux Foundation)
linuxtv.org - V4L, DVB and Components
SANE Supported Devices -
ALSA Hardware Device Information - ALSA SoundCard Matrix
Linmodems - Work with Modems in Linux
Source from this Links: http://wiki.ubuntuusers.de/Hardwaredatenbanken?highlight=open%20printing