Colin Putney announced his "Altitude" web framework for Squeak Smalltalk as open source under MIT license. It's a brand-new, from-scratch HTTP server and application framework written on top of Xtreams.
One needs an up to-date 4.4. image. Code is here and Colin provided a load script.
Colin also explains the difference between Altitude and the more well known Seaside web frameowork for Smalltalk.