Berkely Logo (ucblogo) is an interpreter for the Logo programming language. Logo is a computer programming language designed for use by learners, including children. This dialect of Logo features random-access arrays, variable number of inputs to user-defined procedures, various error handling improvements, comments and continuation lines, first-class instruction and expression templates, and macros.
KTurtle is an educational programming environment using the LOGO programming language. The unique quality of LOGO is that the programming commands are translated to the language of the programmer so that she can program in her native language. This makes LOGO ideal for teaching kids the basics of math, geometry, and programming. One of the reasons many children like LOGO is because of the turtle, a programmable icon (sprite) which can be moved around the screen and used to draw objects with simple commands.
LXlogo is an interactive LOGO programming environment for K-12 educational use or just for fun. It is easy to install with minimal system requirements, and is a modern variant of the familiar "turtle" LOGO language. Logo is interesting because it gives students immediate graphical results with just a few commands or lines of code, and allows students to gradually become familiar with geometric concepts, and how to write programs and think procedurally. As students move beyond the beginning stages, they can move on to create fun animations and user interfaces.
HLogoZ Lite is a script that automatically changes a logo or other image for specific holidays or other dates. There is also a version HLogoZ available as a plugin for WordPress: HLogoZ-WP. It allows you to specify your own custom dates or holidays on which the logo should be changed. It has three modes: image, Flash, and text. All modes can be used together.