When I spend time programming RISC OS, one of the things I like working on are Programming Libraries.

Desktop

Libraries 

For those who don't know, a programming library is a collection of useful segments of code that perform a useful task.

As well as building a few libraries myself, I've also taken on
maintenance and development of a few from other authors. Various
libraries are listed below. Click on them to download the current
release, previous releases and to view the documentation on them.

Tools

No programming library would be complete without useful command line
tools to help build them or produce documentation. You can find some of
mine elsewhere.