Helium was originally developed by Orange Mobile Labs for N900 as research project, so the original developers have not been really maintaining it anymore. Initially in Nemo Mobile we did few patches to first get it running well and we got those also to upstream last summer. Later we did a fork to change the architecture to use Qt Components and now Nemo's fork of the Helium is called Helium Reborn. Helium Reborn can be also run on N9. I haven't tried, but if the Qt components are now available for Fremantle, then running also Helium Reborn on N900 might be possible. BR, Vesku