pkg++ is a tool to build packages. The goal is to provide a tool you can use to build a package from a generic recipe on your distribution/OS and for your native package manager. The recipes, when done correctly, can be used on multiple OSes, and thus users can share them even if they do not use the same distribution. It is as much a way to easily package as it is a way to create multi-OS package recipes repositories.
slkbuild is a script inspired by makepkg from Arch that greatly simplifies the package building process in Slackware and derivatives. It parses an easy-to-create SLKBUILD meta-file and from that creates a conventional build script that follows all of the Slackware packaging standards and that can be run on its own. The advantage of using slkbuild is that it ensures package uniformity and allows for an easy-to-edit meta-file in the event that one might require customization or might need to update the script for new releases. It also makes the build process much quicker, since it takes care of downloading the source, untarring, gzipping man and info pages, stripping binaries, making sure that the menu entry for a graphical application is compliant, as well as a host of other things.
PPM-Make is a Perl module that automates some of the steps needed to make a ppm (Perl Package Manager) package from a CPAN distribution. It attempts to fill in the ABSTRACT and AUTHOR attributes of Makefile.PL if these are not supplied, and also generates HTML documentation. ppm is used in the ActivePerl distribution. ActivePerl is primarily used on Windows and by corporations on other OSes.
Kheops is a PHP source repository for small to medium sized projects. Its aim is to be easy to use but powerful. It features a Web interface, automated archive creation, and other enjoyable features. It works with a Python client to allow advanced users to keep a copy of the sources updated.
CAN is a packaging program that uses a format similar to JAR, but with some improvements. CAN uses only existing, open source tools for its implementation. It packages any executable and libraries, supports executable CANs, and can even tweak environment variables before execution.
Chestnut Package Manager is a utility to handle executables and resource files in a transparent, platform independent, and relocatable way. Its concept is similar to Apple bundles and Java archives. It is implemented in Python. Chestnut makes it possible to invoke programs or obtain resources without knowledge of their absolute or relative path, making them accessible even after relocation of the package to another directory.