Minix editline is the line editing library from Minix, originally created by Simmule R. Turner and Rich $alz in 1992. It can be linked into almost any program to provide command-line editing and history. The editline library is call-compatible with the FSF readline library, but is a fraction of the size and offers fewer features. It is distributed under a "C News-like" copyright; see the file LICENSE for details.
advent4 is a port of the original Colossal Cave text adventure to Unix. It should work without any change on HP-UX, Sun Solaris, *BSD, and GNU/Linux systems. The actual license of this program is unknown, although most people agree that it is likely to be considered to be under the public domain.