OS-9
   Growing article, with links to many related topics. Wikipedia.
   http://en.wikipedia.org/wiki/OS-9

OS-9 Frequently Asked Questions List
   
   http://www.cs.wisc.edu/~pruyne/os9faq.html

OS-9 Samba File Manager
   A software solution that enables Microware OS-9 users to participate in Microsoft networks with file and print services. It provides OS-9 users the ability to mount shared directories or printers on any Windows computer.
   http://www.os9samba.com

OS-9 World Wide Archive
   Information, software, FAQ. Real Time Services, Inc.
   http://os9archive.rtsi.com/wwa.html

OS9Tools
   Package of command line utilities to read/write RBF disk images, has 6809/6309 assembler. Open source, public domain. SourceForge.net.
   http://sourceforge.net/projects/os9tools/

OS9exec: OS-9 Emulator
   Execution environment for OS-9/68k user-mode programs on host OSs: Linux, Mac OS classic and X; Windows 32. Open source, GPL. SourceForge.net.
   http://sourceforge.net/projects/os9exec/

RadiSys Corp.
   Makes Microware OS-9, mature (over 25 years development), full-featured, multitasking realtime OS, with kernel, software components, development tools (IDE), networking, graphics, power management.
   http://www.radisys.com/

RadiSys Microware OS-9 Blog
   Official news, announcements.
   http://os9.typepad.com/

Real-Time Services, Inc.: RTSI
   Systems integrator and distributor for Microware Systems Corp.
   http://www.rtsi.com/