I also could help a little with Linux development, but I have some concerns about the development process: it seems that most of the bugs and patches in sourceforge are actually being ignored. Even some major ones such as
Andrew Church's armthumb patch are still in the tracker with no comments from any VBA developer; I'm not saying that that patch must go in, but hey, please at least post a comment about it so people know if it's worth to spend time developing patches, or if anyway they will never get applied.
