Pkgtools is a package created by Daenyth that includes various useful package-related utilities. It is available in community, and the latest git release is available in AUR.
A tool to simplify creating a new package.
Template:Codeline is a tool that tells you which package owns a specific file. It also has some extra related features.
"Command not found" hook
pkgfile includes a "command not found" hook that will automatically search the official repositories if you enter a command that is not recognized. It can be enabled in Template:Filename or in Template:Filename.
Converts an rpm .spec file into a PKGBUILD