Tiny Life (tlife) is a simple Game of Life implementation designed to work as a filter for the shell, operating solely through standard input and output, with an emphasis on shell integration rather than pretty visuals. It supports customizable output and board sizes, custom rulesets, and random and user-specified seed values for the starting generation.
xc is a simple and handy substitute for sudo. It parses the /etc/xc.conf file, containing a list of identifiers, accesses, and commands. If an identifier (given as an argument to xc) matches the corresponding access (i.e., user or group), the related command is executed. The user can only see the identifiers he can execute, and the real command attached to the identifier remains invisible to him.
Xidel is a command line tool to download Web pages and extract data from them. It can download files over HTTP/S connections, follow redirections, links, or extracted values, and process local files. The data can be extracted using XPath 2.0, XQuery 1.0, and JSONiq expressions, CSS 3 selectors, and custom, pattern-matching templates that are like an annotated version of the processed page. The extracted values can then be exported as plain text/XML/HTML/JSON, or assigned to variables to be used in other extract expressions or be exported to the shell. There is also an online CGI service for testing.