Crosos is a SubLinux Distribution
Crosos is a open-source OS. It is based on the Linux Kernel and mostly uses the same code in Ubuntu (but it has been derived from Debian)
Turtle OS is an Unix-like OS. It aims to be open source, secure, high performing and portable.
librestep is a progressive effort to produce a free, modern and stable OS distribution. To get librestep download and configure TOR and GNUnet then follow the onion link. Bug tracking, SCM, support forums, and some documentation is housed here.