Elevate brain training,
Hacker Tracker for when I went to Defcon,
Dev Tools,

All android apps.

Just my 2 pence, when I hire I'm mostly looking for someone with a passion for coding over experience, or qualifications. If they have the passion they will almost teach themselves and will want to work hard but without you having to force it upon them.

Experience can be learned the hard way as can any technology you require, and although qualifications are important as a measure never underestimate someone who is self tought. The return of effort they will give you is far better.

I think @bryceleo sums it up nicely. I would add that you seem to posses the skills to be a developer so just own your accomplishments and call yourself a developer and grow into it. Anytime you create software your a developer and certainly in my younger days I was a bad one, but a bad painter is still a painter!

Coding is an expressive art form and that's why each developer approaches tasks differently. Just within my team we follow best practices but individuality breaks through. You are a developer go devlope and have fun. Just remember if your the cleverest person in the room, your in the wrong room. Never stop learning and pushing forward. The quest for knowledge is the fun part.

I would stick to one language and ensure you understand the foundation knowledge of programming as the language at this point dosent matter. If you know how to code and problem solve the language is errevlant to a degree you select the language best suited to the task.

Simply stick to one language go build something small every day in the areas you feel less comfortable in. You will get it. Build confidence and move to another language it will feel easier etc.

Good luck.