Help me choose my next project

Lately, I've been coming up with ideas for programs and utilities a lot.

So, here is a list of ideas that I've had over the past 2-3 weeks and come monday I'll be close to done with my personal project on my game. 

Project Ideas: 

Linux Operating System (BASH/GNOME3/ETC)

Personal file storage automation (automating a user's file storage and location on a local drive(not cloud storage))

Small 2D Game Engine

Small 3D Game Engine

A website to help teach Java Interactively (a bit like ruby on rails)

A small website with guides on Tech (could just be guides on here)

Just a few ideas, 

just looking to see what I should do.