PharoSmalltalk is a fork of SqueakSmalltalk version 3.9, initiated in 2008.
The intent of the project founder, StephaneDucasse, is to create a professional SmalltalkLanguage IDE that supports his computer science research. The project has attracted some Squeak users, including the SeasideFramework project, which, as of 2009, is now developed using Pharo.
1.0 beta was released in July 2009.
The current stable version is Pharo 3.0 (as of May 2014).
Pharo manifesto
There is a SymbalooWebMix? with links to PharoSmalltalk resources available at:
http://www.symbaloo.com/mix/pharo