ELF software tools to do things like compile #BF, inject binary resources into an object file, dump the ELF tables, and so on.
Joe Pfeiffer’s tutorial on writing filesystems with FUSE.
Darius’s #500lines chapter draft on the bytecode compiler.
#Wouter’s #ZUI prototype for looking at your filesystem tree, using OpenGL with animated zooms, with embedded image viewers and text editors.
#Wouter’s Lobster programming language, a scripting language for writing #video-games in, features Python-like indentation syntax, Ruby-like blocks as a replacement for all control structures, type inference, multimethods, reference counting, a built-in OpenGL interface, and GLSL shaders. Originally it was dynamically typed, but now (as of September 2015) it has full type erasure.
#Wouter’s various programming language designs.