LispKit

• Squeak4.0 - Released 15 Mar 2010
• Squeak4.1 - Released 18th april 2010.
• Squeak4.3 - Released December 23rd, 2011
• MIT - The MIT license is like BSD without the advertising clause. As free as it gets, suitable for cross Smalltalk 100% reuse. The recommended license for Squeak since the 4.0 release.
• Squeak 4.4 - Released December, 2012
• Bleeding edge - Hardly runnable, full of bugs! For developers only.
• Only extensions, no changes - Code extensions but no changes in existing code.
• Squeak3.9 - Released 8 Dec 2006.
• Squeak5.0 - Released Q3 / 2015.
• Squeak4.5 - For release Q1/2014.
• Squeak4.2 - Released February 11th, 2011
• Stable - Useable by all. Bugs are rare.
• Squeak3.8 - Released 25 May 2005.
• Squeak4.6 - Released Q3 / 2015.
• SqueakL + MIT - Dual licensed under both SqueakL and MIT. This enables both base Squeak inclusion and 100% reuse. Recommended prior to 4.0.

loads fine in 5.1 and 6.0 alpha