Programs for a Sorcerer Supreme

Hello, /prog/.

I know the subject is vague, so let me explain:

I'm confident I know some programming languages very well, but I feel my knowledge is lacking when it comes to many others. So I'm looking for programs that can sharpen up my skills. Stuff that requires one to use most of a language's features. What would you suggest?

C - compilers. Device drivers?
C++ - game engines?
Scheme - an interpreter?
Common Lisp - ?
Haskell - ?
Java - ?
.NET - ?
Scala - ?
Python - ?
Ruby - ?

>>41
That post was bad and you should feel bad.

>>39,40
Xarn only gave House of Leaves 2 stars! ★★☆☆☆

>>11
>C++, C
>low-level

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>>44
★I★A★B★T★ assembly-level is pretty low dude ★I★H★B★T★

Everybody uses C for everything. Go learn C.

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