CVS is a version control system, which allows you to keep old versions of files (usually source code), keep a log of who, when, and why changes occurred, etc., like RCS or SCCS. Unlike the simpler systems, CVS does not just operate on one file at a time or one directory at a time, but operates on hierarchical collections of directories consisting of version controlled files. CVS helps to manage releases and to control the concurrent editing of source files among multiple authors. CVS allows triggers to enable/log/control various operations and works well over a wide area network.
cut2 writes to standard output selected parts of each line of each input file, or standard input if no files are given. It was mean to supplement cut instead of replacing it. cut2 was written to overcome the problem of 'wc -l textfile | cut -f1', which results in the output of a blank line instead of the expected number of lines. Using cut2 instead will give you the expected result.
CustomDNS is a modular DNS server written in Java. It's based on Brian Wellington's dnsjava pacakge, but it adds support for virtual hostnames, SQL databases, and dynamic client updates. You can use CustomDNS out-of-the-box as a clone of ml.org/dyndns.org, or you can use it to develop custom DNS applications.
CURSEL is a freeware FMLI (Forms and Menu Language Interpreter) implementation for Linux and UNIX. CURSEL interprets Menu description files, which are simple text files, describing a character GUI (Menus, forms, text files) for character terminals (xterm, vt100, etc.). Pipes, shell escapes, backquoted expressions, and file redirection are supported, and when compiled with ncurses 5, CURSEL supports color.