mdbook - Gitbook alternative in Rust
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
MkDocs - Project documentation with Markdown.
Wondershare PDFelement - All-in-one PDF editor
GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.