Computer Concepts Impression Publisher. Basically a desktop publishing application comparable to FrameMaker, in handwritten ARM assembly language and running in 4Mb of RAM. Word still doesn't approach it's ease of use.
Artworks was also pretty wonderful. This post has reminded me of so many awesome RiscOS applications. There were so many neat little applications. Most things seemed quite solid too. I guess in part because if they crashed the whole system would go down, so applications were written not to crash. :)
