My third (I think) creation using ui!

GitHub browsepy: https://github.com/Vik2015/browsepy

GutHub browsepy apps: https://github.com/Vik2015/browsepy/tree/master/apps

This is a basic file browser, but you can assign different apps (python scripts) to open files with specific extensions.
Right now I have just text editor (without save option, more like text viewer), but I am going to add more apps. You can add apps yourself too! :)

EDIT: Okay, I've made an App Manager which allows you to easily modify apps and extensions. No more raw json editing :)

Syntax of apps.json is:

{"appname": [".ext1", ".ext2"], "appname2": ["ext5", "ext10"]...}

UPDATE

Added experimental App Manager (currently you can only remove supported extensions from apps).
Also, fixed importing of the programs. Make sure you have __init__.py in your apps/ folder

UPDATE 2

• Normal App Manger, allows you to add and remove apps and modify associated extensions.
• Some bug fixes

UPDATE 3

• Added Delete, Move and Rename options.
• Added New option, allowing you to create new folder/files/templates
• Added Open in editor to the text editor, allowing you to open file in the Pythonista's editor.
• Fixed AppManager (now you can't add an extension if it is already in the list)