GIMP-like program for MOS?
What is partition size and file size limit? (SFS)
I don't think there's anything native that's quite as powerful as GIMP, although there are graphics manipulation programs available.
Originally I had thought that porting GIMP itself would be difficult because of the programs reliance on the GTK-API.
But their is a wrapper that converts GTK-API calls into MUI calls
http://sourceforge.net/projects/gtk-mui/So a GIMP port may be possible, but hasn't been done yet (why don't you do it).
SFS? 128gb limit on partitions, but other software can create larger partitions that can be used (I've played around with this) AND there are other file systems (like IceFileSystem 2.3 - no limits on partition size).
File Size limitations? This I'm none to sure of as I've got several monstrous 720p video files on my hard drive and have never run into a size limitation issue. That said, there probably is a limit under SFS, I just haven't found it yet (and, again, there are alternative filesystems)