Hello,
I would be very happy to help you with this project, and here are my answers to your questions :
1. Favorites tools : Photoshop CC, Macaw, Axure
2. Best Mockup URL : I usually use my own mockup. When I'm not I either use Invision, or Mockerie
3. Invision App: yes I have. Last project was a full mockup (desktop, Mobile, Tablet) for a game app.
I’m a French designer/developer actually based in Colombia (Digital Nomad), and you can check my portfolio here :
https://www.freelancer.com/u/Afrog.html .
Please don't hesitate to contact me via the chat to discuss this further, and I would be happy to answer any questions you might have.
Thanks
Hervé