syspatch is a useful tool to apply OpenBSD patches to a collection of OpenBSD hosts where you don't want to have a compiler (compXX.tgz) and the src (and sys) hierarchy. You build "binary patches" on a buildhost and then deploy them using syspatch.
CompactBSD is a powerful set of tools that allow you to build your own customized,
lightweight distribution of OpenBSD and then burn it onto
compact flash so that it can be run on an embedded PC platform such as FatPort's
FatPoint (www.fatport.com)