Building pack:

[Addetter]

I already have a building pack containing almost all buildings in A2. Is there such a pack for OA too?

[Foxhound]

When you are looking for certain addons use the sticky addon request thread in the ArmA 2 & OA - ADDONS & MODS: DISCUSSION (http://forums.bistudio.com/forumdisplay.php?f=88) section.