whohas is a command line tool that allows you to query several package collections at once. It currently supports Arch Linux (and AUR), Debian, openSUSE, Slackware (and linuxpackages.net), Source Mage Linux, Ubuntu, FreeBSD, NetBSD, OpenBSD, Fink, and MacPorts repositories. whohas was designed to help package maintainers find ebuilds, pkgbuilds, and similar package definitions from other distributions to learn from. However, it can also be used by normal users who want to know which distribution provides certain packages, and which version of a given package is in use in each distribution or in each release of a distribution. License: GNU General Public License (GPL) Changes:
Distributions to be searched can now be specified on the command line, rather than by commenting out code. When none are specified, the whole set is searched (unless commented out in the source code).