Languages
All the content here is the blurb, copied directly from the respective web site.
Rust
Rust is a systems programming language that runs blazingly fast, prevents almost all crashes*, and eliminates data races.
Featuring
zero-cost abstractions move semantics guaranteed memory safety threads without data races trait-based generics pattern matching type inference minimal runtime efficient C bindings
Nim
http://nim-lang.org Nim (formerly known as "Nimrod") is a statically typed, imperative programming language that tries to give the programmer ultimate power without compromises on runtime efficiency. This means it focuses on compile-time mechanisms in all their various forms.
Beneath a nice infix/indentation based syntax with a powerful (AST based, hygienic) macro system lies a semantic model that supports a soft realtime GC on thread local heaps. Asynchronous message passing is used between threads, so no "stop the world" mechanism is necessary. An unsafe shared memory heap is also provided for the increased efficiency that results from that model.
Racket
A programmable programming language.
Racket is a full-spectrum programming language. It goes beyond Lisp and Scheme with dialects that support objects, types, laziness, and more. Racket enables programmers to link components written in different dialects, and it empowers programmers to create new, project-specific dialects. Racket’s libraries support applications from web servers and databases to GUIs and charts.
Pharo
The immersive programming experience. Pharo is a pure object-oriented programming language and a powerful environment, focused on simplicity and immediate feedback (think IDE and OS rolled into one).
Simple & powerful language No constructors, no types declaration, no interfaces, no primitive types. Yet a powerful and elegant language with a full syntax fitting in one postcard! Pharo is objects and messages all the way down.
Feel a live environment Feel the joy of having immediate feedback at any moment of your development: Developing, testing, debugging. Even in production environments, you will never be stuck in compiling and deploying steps again!
Amazing debugging experience The Pharo environment includes a debugger unlike anything you’ve seen before. It allows you to step through code, restart the execution of methods, create methods on the fly, and much more!
Pharo is yours Pharo is made by an incredible community, with more than 80 contributors for the last revision of the platform and hundreds of people contributing constantly with frameworks and libraries.
Amber Smalltalk
http://amber-lang.net A new language and live environment made for the web.
The Amber language is deeply inspired by Smalltalk. It is designed to make client-side development faster and easier. Amber includes a live development environment with a class browser, workspace, unit test runner, transcript, object inspector and debugger.
Amber is written in itself, including the compiler, and compiles into efficient JavaScript, mapping one-to-one with the JS equivalent.