spfmilter is a milter (sendmail mail filter) which implements the Sender Policy Framework (SPF). SPF is a strategy for preventing junk mail. The SMTP standard for email allows anyone to forge anyone else's email address. SPF verifies that the Sender address of an email message matches (according to some policy) the client IP address that submitted it.
spill manages symbolic links under one tree which point to matching filenames in another. When individual projects are configured with project/version-specific -- prefix= settings, to keep their installations segregated, spill can make them appear to be installed in a common place, e.g. under /usr/local. It can also delete the links associated with a particular program. It is similar in concept to various other programs such as stow, depot, and relink. However, it's written in C, so it isn't reliant on an interpreter being available. It also doesn't assume complete control of the directory tree where the symbolic links are created. It can create both absolute or relative symbolic links, the latter being more convenient in some setups.
spim is a self-contained software simulator for running R2000/R3000 assembly language programs. It reads and can immediately execute files containing assembly language code. spim also provides a debugger and simple set of operating system services. spim provides both a simple, textual interface and a fancier, graphical interface. The package includes complete source code and documentation.