Marker is a command palette for the terminal. It lets you bookmark commands (or commands templates) and easily retreive them with the help of a real-time fuzzy matcher.
Mycli is a command line interface for MySQL, MariaDB, and Percona with auto-completion and syntax highlighting.
a pipeable JSON parser written in Bash
A command line interface for 1Password
jq is a lightweight and flexible command-line JSON processor.
PhantomJS gives you command-line access to the features of WebKit. According to its website: "Literally it acts like any other WebKit-based web browser, except that nothing gets displayed to the screen (thus, the term headless)." It has native support for DOM handling, CSS selector, JSON, Canvas, SVG, and JavaScript. You can use to test JavaScript, render Web pages as PDFs or perform more complex Web-based actions such as finding recent tweets by a particular Twitter user.