SeeLogo - A Logo variant with an emphasis on visual aspects of programming. Includes image manipulation tools, tutorials, and samples. Originated in the 1980's, with ongoing development. Dani Novak, Ithaca College. - http://www.ithaca.edu/seelogo
Imagine Logo Companion Site - Resource guides, project gallery, add-ons, plug-in, updates. Logotron Ltd. - http://www.logo.com/imagine/index.html
Imagine Logo (Secondary) - Offers web integration, powerful animation and extensive multimedia capability. Logotron Ltd. - http://www.logo.com/cat/view/imagine-secondary.html
TinyLogo - Programming language and program execution environment for 3Com Palm systems; very friendly to beginning programmers or users who want a simple idea of what programming is about. Has Turtle Graphics. - http://www.palmgear.com/index.cfm?fuseaction=software.showsoftware&prodid=3775
Logo Tree Project - Table of more than 160 known Logo implementations, past and present. Pavel Boytchev. - http://www.elica.net/download/papers/LogoTreeProject.pdf
Imagine Logo (Primary) - A multimedia version of SuperLogo, designed for ease of use by children. Can save projects to the web or as standalone .exe programs. Logotron Ltd. - http://www.logo.com/cat/view/imagine-primary.html
TKTSLogo - A traditional Logo interpreter designed for optimization and parallelism; under development. Hunter Family Publishing. - http://www.thehunters.org/logo/tktslogo/
Berkeley Logo - Information on books about Logo; home of free UCB Logo system. - http://www.cs.berkeley.edu/~bh/
TurtleTracks Logo - Versions for Java, J# for .NET, partial on-going port to C# using MS JLCA: Java Language Conversion Assistant. Downloads, documents. - http://www.mech.upatras.gr/~robgroup/logo/turtletracks/
StarLogoT - An extended version of StarLogo 2.0.4 for the Macintosh is available for download. Also projects, documentation, models, links and resources. - http://ccl.northwestern.edu/cm/
XLogo - A logo learning and drawing application written in Objective-c for Mac OS X. [Open source, BSD License] - http://xlogo.sourceforge.net/
StarLogo - Specialized Logo version which lets you to control thousands of graphic turtles in parallel, which can be programmed to react to their environment. - http://education.mit.edu/starlogo/
Yellow Brick Logo - MIT Yellow Brick Logo (MIT-YBL) is an implementation of the Logo language for the LEGO RCX Brick. Includes: An MIT-written replacement for the firmware operating system that is loaded into the RCX Brick, and Software that runs on a Macintosh or Windows - http://el.media.mit.edu/projects/ybl/
Elica Logo - Educational Logo Interface for Creative Activities: Logo-based system and many related interactive projects, for Windows; information, previews, download. - http://www.elica.net/
Terrapin Software - Logo software for home and schools, projects, resources, support. Now supports Lego's Mindstorm RCX Robotic kit. Also makes Crystal Rain Forest. - http://www.terrapinlogo.com/
Logo++ - Simplified syntax Logo, very easy, within a few minutes one can start programming and drawing complex graphics with few lines of code; runs in graphical environment (Linux X11, Windows), has own editor; coded in C++. [Open Source, GPL] - http://clpp.sourceforge.net/