What is Reddit's opinion of Querious?
From 3.5 billion Reddit comments

➔ Querious website

By popularity on Reddit, this Service is:

#36 in Database Manager apps

1 review of this app found across Reddit:

I use Querious (Paid) http://www.araelium.com/querious/ to interface with my MySQL servers

I know some people who use Sequel Pro (Free) http://www.sequelpro.com/

I find Querious works better for me.

As far as modeling, MySQL Workbench is free and multiplatform: http://mysql.com/products/workbench/