Hi again,
Sorry i forgot to answer this part:
Can I run command-line application (not to mention about gui app)?
Yes of course you can run commandline applications. What else would be the use to target this platform ? :-)
GUI applications, yes. But with a caveat: it requires MUI 3. You can even run Lazarus if you have a very beefed up Amiga. If that is useful... well not exactly. For that you better cross-compile.
Besides that, MUI isn't really suited for Lazarus widgets, but it does work. We've tried fpGUI as well, which does run as well. It is no problem creating native MUI or intuition applications. ALB has even a special MUI class for that (which is also used for Lazarus).
Take a look at ALB's blog: blog.alb42.de where he showcases his apps (He ocassionally drops my name there as well ;-) )