Apropos of D and Phobos, two posts from my blog:
Simple parallel processing in D with std.parallelism (it really did speed things up, ~3x (CPU, not I/O), by my unscientific and small test at least):
https://jugad2.blogspot.com/2016/12/simple-parallel-processi...
D language front-end merged with GCC 9; some sample D programs:
https://jugad2.blogspot.com/2018/10/d-language-front-end-mer...
Excerpt from the link above, that says what the post is about:
"Here are a handful of D programs that use various features of the language and some of its libraries, on my blog. Most of them are simple command-line utilities to do various things. Readers may find them of use to get a flavor of the language and to know some of the kinds of things it can be used for."