Huge thanks to yesplan.be for hosting Camp Smalltalk at ESUG 2012 in Gent, Belgium! I walked in and connected my computer to a humongous display and wireless keyboard/mouse, and connected myself to a humongous pile of speculoos, koffie, and Belgian chocolate. :) All while a charming street festival went on outside. This is the perfect recipe for classic code!
CodeCity started out in VisualWorks, but issues around Cincom's licensing have driven the development efforts to Pharo. The toolset is not open source, which means that people are choosing to use Pharo for proprietary, commercially oriented work.
If you want to see the tools in action, grab the video (wmv format)
Mark Roos spoke at the last Oracle conference about RTalk - a Smalltalk environment for the JVM. There's video here, which it doesn't seem that I can embed. You can also watch the slideshow presentation.
mariano has been extending Fuel to give Pharo the same kinds of code tools that VisualWorks (and ObjectStudio) have with parcels:
Right now the common way to export and import packages in Pharo is by using Monticello (or doing fileOut, which is almost the same). This ends up exporting the source code and then compiling it during the import. Tanker is a tool to export and import packages of code in a binary way using Fuel serializer. Using Fuel enables us to avoid having to compile from sources during the import. Tanker understands the concept of “packages of code” and the correct integration of them into the system. For example, it initializes classes, sends notifications, etc.
If you follow the link there's a lot more explanation, as well as usage instructions. There's also a screencast available
The Altitude web framework has reintroduced work done on a new streams library Xtreams. Traditional Smalltalk-80 streams have served well for decades. Michael Lucas-Smith and Martin Kobetic started Xtreams as an attempt to distill some of their experience into a new implementation of streams. A great video of the 2010 ESUG talk is available here
While Xtreams originated in Cincom Smalltalk, the full codebase is no longer available in the Cincom public repository (you would have to check with Cincom to find out why that is; I have no idea). That means that going forward, Pharo and Squeak are probably your best sources for Xtreams.
Update: Looks like Cincom changed their mind - the code is now in the public store repository