NixNote is described as 'Formerly Nevernote, is an open source client for Evernote' and is a very popular Note-taking tool in the office & productivity category. There are more than 100 alternatives to NixNote for a variety of platforms, including Windows, Mac, iPhone, Web-based and Linux apps. The best NixNote alternative is Notesnook, which is both free and Open Source. Other great apps like NixNote are Zim, TagSpaces, Trilium Notes and CherryTree.
Notetaking and blackboard replacement application. Inspired by Xournal. Written in C++/Qt for Linux / Windows. It has the ability to annotate PDF files and has a few other options (e.g. markdown support).
