A non-exhaustive list:

- Amber Smalltalk provides a Smalltalk layer on top of JavaScript: http://www.amber-lang.net/

- Indium adds JavaScript tooling support and runtime interaction to Emacs and brings a few Smalltalk features such as object inspection (the project creator and maintainer is a Smalltalker and author of Amber): https://github.com/NicolasPetton/indium

- Lively provides a Smalltalk-like environment (code browsing, editing) as well as object(-graph) persistence, similar to the Smalltalk image idea, and mixes in some ideas from Self: http://lively-next.org/

Lively's meta interface is separately usable via lively.vm and lively.modules: https://github.com/LivelyKernel/lively.vm https://github.com/LivelyKernel/lively.modules