Implementations
As of March 2009 there were 197 implementations and dialects of Logo, each with its own strengths. Most of those 197 are no longer in wide use, but many are still under active development.
As yet there is no single agreed-upon Logo language definition or standard, though there is a broad consensus on core aspects of the language. There are substantial differences between the many dialects of Logo. The situation is confused by the regular appearance of turtle graphics programs that mistakenly call themselves Logo.
Logo use peaked in the early-to-mid 1980s, largely due to marketing of Apple Logo (for the Apple II computer) and TI Logo (for the TI 99/4A) to primary school educators, emphasizing Logo's usefulness in teaching computing fundamentals to novice programmers. Apple Logo, which was developed by LCSI, was the most broadly used and prevalent early implementation of Logo.
The closest thing to a de facto standard Logo today is UCBLogo, also known as Berkeley Logo. It is free and cross-platform. UCBLogo has only a rudimentary graphical user interface, so several projects exist that provide a better interface. MSWLogo and its successor FMSLogo, for Microsoft Windows, are commonly used in schools in the United Kingdom, Australia and Greece. Commercial Logos that are still widely used in schools include MicroWorlds Logo and Imagine Logo.
MSWLogo supports multiple turtles, and 3D Graphics. MSWLogo allows input from COM ports and LPT ports. MSWLogo also supports a windows interface thus I/O is available through this GUI- and keyboard and mouse events can trigger interrupts.
Simple GIF animations may also be produced on MSWLogo version 6.5 with the gifsave command.
Some modern derivatives of Logo allow thousands of independently moving turtles. There are two popular implementations: MIT's StarLogo and CCL's NetLogo. They allow for the exploration of emergent phenomena and come with many experiments in social studies, biology, physics, and other areas.
Most Logos are 2D, but the Elica interpreter is notable for supporting 3D graphics. Most Logo implementations are interpreted, but some compilers have been built, including the Lhogho compiler, by the same author as Elica. Although most often used for graphics, Logo can also control robots. It was interfaced with Lego bricks, although Lego decided later to use another language in the commercial Lego Mindstorms products. An interface also exists for Cricket robots.
ObjectLOGO is a variant with object-oriented extensions.
Logo3D is a tridimensional version of Logo and can be found at Logo (programming language) on SourceForge.net.
TurtleTracks, an opensource Logo implementation in Java, was designed and implemented by Daniel Azuma, based on BSD Logo (with various extensions). It was later ported to .NET / J# by George Birbilis.
E-Slate Logo is an enhancement of TurtleTracks Logo with object-oriented programming (OOP) primitives (TELL, ASK, EACH and TELLALL). It was designed and implemented by George Birbilis.
In 1990 a version appeared for the Acorn Electron, Electron User in February 1990 published Timothy Grantham's simple implementation of this programming language under the article "Talking Graphics", a first glimpse most electron users ever saw of this simple but intuitive programming language.
Now (in 2012) a new version of Logo Called Visual Logo is developed by Indian institute of Software Technology. But still the product is not available in market
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