toolwrap is a tool for managing package installation that extendes the functionality of Stow or Tinypackage. It makes it possible for different releases of a given application to coexist on a single workstation or be deployed on a file server. Policies files allow end-users to select which package is used when a tool is invoked from the command line.
Mpkg is a ports collection. Each port contains the information necessary to automatically download, compile, and install a specific program, and also information about dependencies between programs. Ports collections are common on various BSD flavors, but mpkg is designed to be portable to any UNIX-like system. Development has been done on DEC OSF/1, GNU/Linux, and Solaris. Mpkg also tries to install all programs in separate directories, never touching the common directories like /usr and /etc.
rsync is a replacement for rcp (and scp) that has many more features. It uses the "rsync algorithm" which provides a very fast method for remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand.