Outwiker Personal Wiki and Outliner Software
Outwiker is a free and open source personal Wiki and outliner application for Windows and Linux. Using this Outwiker application you can store notes in a tree and it store notes as folders on disk. It comes with tags, page links, bookmarks, icons for notes, attach files, different page types and plugins support. You can also insert image in page and create plain text, HTML pages and wiki pages.