OmniFlop Floppy Disk Transfer Program A great Windows applicaiton to read/write floppy diskettes to/from image files. It runs under Windows 2000, Windows XP, Windows Vista and Windows 7, Windows 8 and Windows 10
MB2K2 - Microbox 2K2 (MB2K2) Microbox 2K2 6809 and FLEX based single board computer.
This is a great little XMOS based 6809 emulator. To see the main project page on hackaday.io click here.
Vintage Computing by Mike Douglas
This website focuses on early personal computers from the mid 70s into the early 80s.
Here you'll find resources for restoring and maintaining many of the great computers and
peripherals from this era.
Hex-Rays IDA Pro disassembler (used to be Data Rescue) - I have a link to this site only because it's the best disassembler on the market. I have been using it for years for all types of microprocessors and it works. I even have some plugin files for FLEX and OS9 that the author helped with. I have used it to disassemble FLEX for the 6809 and 6800.