Rpm2tar is a utility for converting the contents of a binary RPM package into a gzipped tar archive. Rpm2tar attempts to preserve file ownership, groups, and permissions as they are stored in the RPM package. Rpm2tar handles files only; it does not handle pre- or post-install scripts, triggers, '%config' tags, or any other fancy features of RPM.
rproxy is an extension to HTTP which allows transferring of differences between a web server and client, using an algorithm similar to rsync's. This works particularly well for dynamically-generated sites, where the pages are often similar but not the same on each visit. Transferring just the difference reduces network traffic and therefore loading time.
Rscript is written in Expect/Tcl and allows you to automate remote logins and execute a list of commands remotely. It is also useful for scheduling tasks using your local cron instead of the remote cron. rscript is able to execute commands as the superuser (using su) as well. It has support for ssh, ssh2, telnet, and ftp protocols as well as optional remote mail notification of all output. A compact Tcl config file parser is included, as well as example files. A TK GUI frontend allows point and click execution of remote scripts and a window for script output.