First post, which is unrelated to Whonix.
HGL is a compiler/interpreter suite for developing images. It features its own simple but powerful language, an output format configurable by plugins, runtime input handled by plugins, and easy integration into various environments like Web servers or graphical applications. The input is taken from a source file, which has to be compiled for quick and frequent access by the interpreter. An interpreter then runs the compiled files, takes input from custom plugins (if necessary), and outputs its result via custom plugins.
sourceforge download: https://sourceforge.net/projects/hgl-suite/files/?source=navbar
Why this post? Heiko Schäfer helps out creating an updater for Whonix. It's only fair to help his project getting the attention it deserves.
Heiko also likes to get feedback for HGL, new contributors and developers are welcome as well.