N Docs allow you view, create, and edit documents on Android. No internet connection is required.

* View file types :
– Microsoft Word(DOC/DOCX, don’t support password protected file)
– Microsoft Excel(XLS/XLSX, don’t support password protected file)
– Microsoft PowerPoint(PPT/PPTX, don’t support password protected file)

– Open/Libre Writer(Open with thirdparty app)
– Open/Libre Calc(Open with thirdparty app)
– Open/Libre Impress(Open with thirdparty app)

– Hancom Hanword(Open with thirdparty app)
– Hancom Hancell(Open with thirdparty app)
– Hancom Hanshow(Open with thirdparty app)

– Portable Document Format(PDF, support password protected file)
– RTF
– TXT
– MARKUP(MD/HTML/XHTML/XML/DTD/XSL/XSLT…)
– CODE(JAVA/CPP/PHP…)
– EBOOK(EPUB)

* Create file types :
– PDF
– TXT
– HTML

* Edit file types :
– TXT
– MARKUP(MD/HTML/XHTML/XML/DTD/XSL/XSLT…)
– CODE(JAVA/CPP/PHP…)

* Storage services :
– Google Drive
– Microsoft One Drive
– Box