ttyrpld is a multi-OS kernel-level tty key and screen logger. Recorded sessions can be followed live or replayed at a later time. Supported platforms are Linux, Solaris, FreeBSD, NetBSD, and OpenBSD.
SCCS is an implementation of the POSIX standard Source Code Control System. It is based on the original UNIX SCCS code provided by Sun as part of OpenSolaris and was made portable to other platforms.