Programming languages:

• C
• C++
• Java
• Ruby
• Python
• Perl
• Common Lisp
• Clojure
• JavaScript
• Go
• Rust

Markup / Markdown / Style languages

• HTML
• CSS
• Markdown

OS platforms:

• Linux
• macOS
• Windows
• FreeBSD
• Android

Spoken Languages:

• English
• 日本語