ALT is a set of Linux distributions based on Sisyphus, an APT-enabled RPM package repository that aims to achieve feature completeness, usability, and security in a sensible and manageable mixture.
Fink is a package management system for Mac OS X and Darwin systems. It utilizes Debians apt and dpkg tools, while "fink" itself is the source to package building system. The project also adapts sources for broader compatibility with Mac/Darwin systems.
UBOS is a distro that aims to make it 10x easier to run server-side apps for yourself, or for your family, on hardware you own. It does by providing single-command web application install, uninstall, backup/restore and systems upgrade, including all server configuration, database provisioning, data migration etc. UBOS now also provides single-command network configuration, including DHCP, mDNS, DNS, firewall, masquerading and integration with Letsencrypt. Current supported platforms: x86, Raspb
FreeDOS is a complete, free, DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS. It doesn’t cost anything to download and use FreeDOS. You can also share FreeDOS for others to enjoy! And you can view and edit our source code, because all FreeDOS programs are distributed under the GNU General Public License or a similar open source software license.
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.