Actionscript vs Nim

Easy 2D and rich 3D capabilities means ActionScript is a great game prototyping or production tool. Relatively easy to get images on a stage and easy to share with it's wide platform support.

Online games and a colorful history means there are a lot of existing scripts and examples on the internet for available integration as well as tutorials.

Runs on all major platforms as an AIR executable or mobile app, as well as in-browser as a FLASH file.

Teaches strong typed habits and follows many conventions of major programming languages.

The same code can be used for web, server, desktop and mobile.

Checks your code at compile time.

Imperative, OOP, functional programming in one language.

Nim has "asyncdispatch" module, which allows you to write async applications.

You can use Nim with any language that can be interfaced with C.
There's a tool which helps you to create new C and C++ bindings for Nim - c2nim
Also you can use Nim with Objective C or even JavaScript (if you're compiling for these backends)

Nim has a lot of common with Python in terms of syntax.
Indentation-based syntax, for/while loops

Nim has built-in VM, which executes macros and some other code at compile time.
For example - you can check if you're on Windows, and Nim will generate code only for it

There are generics, templates, macros in Nim. They can allow you to write new DSL for your application, or avoid all boilerplate stuff.

You only need to specify types in your procedures and objects - you don't need to specify type when you're creating a new variable (unless you're creating it without initialization)

With built-in "unittest" module you can create test with a very readable code

You don't need to deal with all those manual memory allocations, Nim can take care of it!
But also you can use another GC, or tweak it for you real-time application or a game

You can use unicode names for variables, there is "unicode" module for operations with unicode

writeLine(stdout, "hello") can be written as stdout.writeLine("hello")
proc add(a: int): int = a + 5 can be used like 6.add.echo or 6.add().echo()