Asciidoc FX is a book / document editor to build PDF, Epub, Mobi and HTML books, documents and slides. AsciidocFX is also a winner of Duke’s Choice Award 2015.
TeXworks is an environment for Authoring TeX (LaTeX, ConTeXt, etc) documents, with a Unicode-based, TeX-aware editor, integrated PDF viewer, and a clean, simple interface accessible to casual and non-technical users.
Notepad2-zufuliu is a light-weight Scintilla based text editor for Windows with syntax highlighting, code folding, auto-completion and API list for many programming languages and documents