Jeoss Linux is a compact install-everywhere Ubuntu based server oriented distribution. It is directly-installable even on legacy, limited resource, and embedded x86 platforms. The install process can be controlled from start to finish by the target local console, a remote serial console, or a remote SSH sesion.

The JeOS (Just enough OS) concept was introduced in 2007 with Ubuntu JeOS 7.10, then in 2008 made it as a variant of Ubuntu's LTS (Long Term Support) Server v8.04. At that time JeOS was a small version of Ubuntu's server OS, paradoxically including a Virtual kernel that has been tuned thinking of virtual appliances and products such as VMware or KVM.
Today the idea behind Jeoss is keeping the very interesting compact size concept of the original JeOS. But now with a real server kernel and dramatically improved install capabilities is re-targeted for supporting and being directly-installable even on legacy, limited resource, and embedded x86 (32bits) platforms.
Jeoss in a Nutshell

x86 (32bit) i586 (not PAE required) Low Latency Server kernel
Simple and direct installation even on Headless and/or DVD/CD drive-less platforms
Direct installation on Flash devices (Pen Drive, Compact Flash, SD, HDSD, etc)
Full PXE Network install support
Full Serial & SSH Console install support
Not Internet connection requiered during install.
Full Install ISO image 136Mb
128MB required RAM
Some of the included preconfigured working-out-of-the-box optional packages:
OpenSSH
Madwifi-ng Atheros WIFI driver
Asterisk PBX
Webmin HTTPS remote administration
Apache2 HTTP server
Lighttpd HTTP server
ProFTPD FTP server
Rpcapd Remote traffic capture daemon
MC File Manager
etc
Ubuntu repository packages directly installable; apt-get install <package-name>