LOGO is a *(programming language), dialect of _(Lisp), developed as a tool for learning.

<ul class="links">
<li>The _(LOGO foundation|http://el.media.mit.edu/logo-foundation/)</li>
<li>The _(LOGO User Ring|http://caggiano.members.atlantic.net//logo/logoring.html)</li>
</ul>

<ul class="implementations">
<li>_(Terrapin software|http://www.terrapinlogo.com/), a proprietart implementation for education</li>
<li>_(StarLogo|http://education.mit.edu/starlogo/) is an extension of classic LOGO where multiple turtles can be controlled in parallel and interact with their environment, suited for modeling complex decentralized systems</li>
<li>_(NetLogo|http://ccl.northwestern.edu/netlogo/), a further-developed version of StarLogo.
</ul>

More reference on the LOGO foundation page.