Pkgin (not pidgin ;-) is a tool developed by a NetBSD developer, to conveniently handle and manage pkgsrc binary packages and is aimed to be an apt / yum like tool for managing pkgsrc binary packages. Pkgin relies on pkg_summary for installation, removal and upgrade of packages and associated dependencies, using a remote repository.
Many GNU/Linux distributions provide a convenient way of searching, installing and upgrading software by using binary archives found on “repositories”. NetBSD and operating systems relying on pkgsrc have tools like pkg_add and pkg_delete, but they are unable to correctly handle binary upgrades, and sometimes even installation itself.
Baptiste Daroussin has started porting pkgin to FreeBSD a couple of weeks ago. Although pkgin relies on pkgsrc packages (NetBSD, DragonFlyBSD), Baptiste has patched it so it can handle FreeBSD ports binaries.