Amiblitz IS Blitzbasic and runs on os3,os4 and mos
compiles for 1.x - 4.x and mos
Amigaversion becomes opensource in the past and is still under development today.
Many nice new features: new gui, includes for rtg,ahi,os4,mos etc
Blitzlibs still better for customchips (faster)
Inside the download the docs are in english
There is a part for english speaking people on the forum too