ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Docsie - Docsie makes it easy to create and maintain your website documentation, without having to deploy it...
Rulingo - Translation workflow automation solution
ReadMe - A collaborative developer hub for your API or code.
SDL Trados Studio - SDL Trados Studio is the complete translation environment for language professionals who want to edit, review and manage translation projects.
Doxygen - Generate documentation from source code