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/
OS-9 World Wide Archive - Information, software, FAQ. Real Time Services, Inc. - http://os9archive.rtsi.com/wwa.html
OS-9 - Growing article, with links to many related topics. Wikipedia. - http://en.wikipedia.org/wiki/OS-9
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
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/