BeOS

The BeBox Zone
Technical Specifications for BeBox components, historical information about BeBox development, and anecdotal information about the use of BeBoxen.
http://www.bebox.nu

BeDrivers
Driver resource site with forum.
http://www.bedrivers.com/

BeOS Radio
An internet radio station that plays music created from BeOS users.
http://www.beosradio.com

The BeOS Tip Server
Hundreds of tips, tricks, shortcuts, and undocumented secrets by and for BeOS users.
http://www.betips.net

The Green Board
Forums and information for users and developers of the Be Operating System.
http://www.thegreenboard.com

Haiku Project
An open-source operating system currently in development and inspired by BeOS. Its kernel is based on NewOS. Open source, released under the MIT license.
http://haiku-os.org/

Kirilla
A site serving content to the BeOS newbie.
http://www.kirilla.com

ZetaNews
Offers the forums and the latest news on the BeOS based Zeta OS and other BeOS like OSs.
http://www.zetanews.com