Binmay is a command line binary search and replace program. It allows one to specify a binary string (in hex) to search for and, optionally, a binary string to replace it with. One can mask both search and replace strings as one can mask an IP. It is handy for changing broken user SID/RIDs in ntuser.dat files after you move a profile from somewhere to somewhere else.
audiopreview is a command-line tool that plays previews of many audio file types (Ogg, MP3, etc.), video file types (AVI, MPEG, Real, etc.), and Internet streams. It can also be used as a regular command-line media file player (i.e. play the files entirely like yauap or mpc123 would).
selector is a command line utility for dynamic string selection. It reads the content of the specified files, and as the user types a list of strings separated by ";" (or a regexp), the display is updated in real time to show only the lines containing all the said strings (or matching the regexp). This command was mainly designed as a way to search in the shell history, for which it is substantially more efficient than the standard readline ^R binding. With the -v option, it injects the selected line into the tty input buffer, hence allowing the user to edit the line and execute it as a standard command.
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.