I'm looking for an offline and portable personal information manager software.
I want my articles (HTML or RTF) to be organized in a tree structure.
Articles should be editable in WYSIWIG mode or Convertable from a markdown(StackeExchange or GitHub flavour preffered).
I need articles to contain source code(formatted if possible),Include Images and tables, links to other articles(Optional Requirement)
License : Open Source and Free OS : Windows 7+ and Linux