Map Note is described as 'Using map notes, you can spread your ideas anywhere on an infinitely spread canvas' and is an app in the Office & Productivity category. There are more than 100 alternatives to Map Note for a variety of platforms, including Windows, iPhone, iPad, Android and Mac. The best alternative is Joplin, which is both free and Open Source. Other great apps like Map Note are Standard Notes (Freemium, Open Source), Microsoft OneNote (Freemium), Evernote (Freemium) and CherryTree (Free, Open Source).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS, SyncTex support with gedit, comics books (cbr,cbz,cb7 and cbt). For a comprehensive list of formats supported, see Supported Document Formats.