Hi,
Invasion 1944 definitely has some SP missions, but I have never tried them. All the units and maps are available in the editor, its fairly easy to make a basic mission, especially with all those youtube tutorials out there

The unsung mod is same as above, at least the last time I checked. I'm not sure how many SP missions come with that mod but I definitely remember playing at least one

I haven't played the project reality mod, but since the community round it is very PVP focused I can't see there being many SP missions for it unless someone made one and uploaded it to a fansite. like the others it should work in the editor although it may act as a replacement mod like ACEmod, in which case it might seem like nothing new is added but in reality it alters damage values behind the scenes. you may need to use some game scripts from the "modules" tab in the editor to use any extra functions but other than that is should work like above.

Hope that helps

It took a whole week for someone to reply, this is why I don't like the dedicated forums :P

anyway thank you for the information, better late than never :)

The gog forum for ArmA isn't the most active one to begin with, and the chance that someone tried the mods you asked about were pretty slim. You might be better off asking such questions on dedicated ArmA Forums. I would have gladly helped you, but i too have no experience with these mods. The only extensive single player campaign i know of is Nightstalkers.

I just took a quick look at project reality, there doesn't seem to be any missions supplied with the client installer but I think that's how it was with the battlefield 2 version. There are two new maps to play with in the editor but like I suspected it must need some scripting to make a functional mission in the editor

As I said in another thread , I strongly suggest the ECP Redux addon.
With 350+ missions and about a dozen of single player campaigns, I think it will be a worthy addition for the single player experience of this awsome game ;)