It is nice it is true. But some time ago SequelPro was crashed on my Mac. Since then I moved to TablePluse. It is much more convinent for me. Contain everyting what I need and I can use for manage another types of database (Redis, Postgres, Mongo..). I highly recomend TablePlus.

Is it open source as well?

Unfortunately not. But it is worth the price. You can try with free version but it is limited.

Finally made ​​it all levels ;). http://rawgit.com/ was helpful

Someone solved the level 6?

Hint: there are other URL schemes.

you can use ftp or just prepend a space before http