Listaller unifies the way you manage software on your Linux system by providing a user-friendly, application-centered software manager GUI. It also provides a software setup package format (the IPK package format), which works on all Linux distributions, as well as tools to make your application binaries work on every Linux distribution. The project has merged with Autopackage some time ago. One of Listaller's strengths is its close integration with AppStream and PackageKit. This means that you will be able to manage Listaller-installed applications with your favorite package-manager, like GNOME-PackageKit, Apper, or even the Ubuntu Software Center. Listaller is primarily designed to be run on Linux distributions, but it could be ported to *BSD.
The 64 Studio Platform Development Kit (PDK) is a version control system for GNU/Linux distributions, allowing the creation and management of many different projects, based on Debian and Ubuntu sources. PDK is written in Python, and the source code is well commented and contains documented examples.
Spkgtool is a software management system that uses symbolic links for maintaining packages and a "ports" style backend for building package from source tarballs. It has its own built linking application, but it also can act as a GUI frontend to your favorite symbolic link package system (supporting graft, epkg, and stow). It is written with bash scripts and Makefiles. The GUI is dialog and Xdialog (depending on your environment). Aside from building ports, it will also build and install "GNU-friendly" source tarballs.
rsync-bc (rsync backup client) is a stripped-down version of rsync. The idea behind rsync-bc is to provide a simple client that only supports sending data. Receiving, local file transfers, and daemon/server modes have been disabled. No destructive file operation functions will be present in a binary.