Added Todour into the list

Other-Todo.txt-Projects.md

@@ -20,6 +20,10 @@ https://github.com/mNantern/QTodoTxt
 This is my favorite version--it has extensions where you can add due date, links, percent done, etc. 
 https://github.com/abztrakt/ya-todo-py
 
+# Cross platform
+
+[**Todour**](http://nerdur.com/todour-pl/) is a simple and fast GUI for Mac, Windows and Linux for managing a todo.txt list (written in C++/Qt)
+
 # Mac
 
 [**TodoTxtMac**](https://mjdescy.github.io/TodoTxtMac/) ([source](https://github.com/mjdescy/TodoTxtMac)) is a minimalist, keyboard-driven to-do manager for Mac OS X that conforms to the todo.txt format spec. 
@@ -62,4 +66,3 @@ Windows Phone 7/8: In the Windows Phone Store and https://github.com/hartez/Todo
 Emacs major mode for editing todo.txt files: https://github.com/avillafiorita/todotxt-mode
 
 Emacs-based application for managing your todo.txt file: https://github.com/rpdillon/todotxt.el
-