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

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

NitrOS-9  
   Realtime operating system for Hitachi 6309, Tandy/Radio Shack Color Computer, runs in native mode, so is only 99% OS-9 compatible, minimum 10-15% faster; can free 16K more system RAM in crowded systems; download. [Open Source]
   http://www.nitros9.org/

OS-9 World Wide Archive  
   Comprehensive set of OS-9 resources, including latest version of OS-9 FAQ, companies list, FTP archive; maintained by Allan Batteiger.
   http://os9archive.rtsi.com/

DTR: Data Processing Technology Reischke  
   Many OS-9 tools and utilities; OS9MAX32/64 reads OS-9 disk on PC; OS-9/68k devTOOL, 100 OS-9 utilities with source; disk defragmenter; remote control software; flash memory manager; backup any OS-9 media on PC: CD-ROM, network.
   http://home.t-online.de/home/dtr-kiel/

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/