Dear full stack ruby developers, what gadgets can you not live without?

You are comparing apples to oranges. WordPress is a platform, Ruby is a web framework. If you are looking to develop a completely custom platform, you could certainly do it in Rails, but you could also write it in PHP (like WordPress). I'd do some digging and see what is out there for pre-made software first before you build something from scratch. I'd imagine there are already plugins that would do this sort of thing for Expression Engine, Joomla or WordPress. No need to re-invent the wheel!

Hosting: Heroku: Great for small applications and getting off the ground as fast as possible. It's easy to manage and your team can focus on features instead of worrying about maintaining operations. Cloud (AWS, Rackspace, Azure): Great if you're expecting growth. You can start up instances easily and shut others down if you don't need them anymore. You still need to manage your servers, but as you grow to several servers, it'll be worth it. Inhouse: If you don't expect growth, or you have enough money to hire a few people to take care of the equipment, this is the cheapest option for computing power. I wouldn't recommend it for a new company since it takes so much maintenance. Deployment: This depends on which environment you work on. Ruby has Capistrano, Python has fabric, etc. Heroku also has their own deployment method and some other cloud providers also do. A quick google search will most likely lead you to the most popular method for your technology. Chat: My favourite is Hipchat (http://hipchat.com/). There's also Campfire (https://campfirenow.com/) and several other providers. Hipchat has a native client for each platform (even mobile) that gets really handy. Error monitoring: This is also a field with many competitors. My favourite by far would be Sentry (http://getsentry.com). There's also Airbrake (http://airbrake.io/) and HoneyBadger (https://www.honeybadger.io/). System Monitoring: This depends on what you want to monitor. The most popular in the ruby world is NewRelic (http://newrelic.com/). It monitors application and database performance. If you just want to monitor your server (cpu, memory, uptime), you can try out Server Density (http://www.serverdensity.com/).

I'm surprised other people are giving you concrete answers as it is impossible to say. How much have you invested in building the current ROR based system? Are the developers happy to code with both or are they simply steering you towards the technology they know? Magento is a great platform. Extensions are a double edged sword, they can be very good and save a lot of effort. Likewise there are some terrible extensions out there. The cumulative effect of adding lots of extensions can be really bad as well. Ultimately, you are likely to get what you pay for, no matter which platform you go with.

Books. http://www.sandimetz.com/products

Rails is a full-stack framework that emphasizes the use of well-known software engineering patterns and paradigms, including convention over configuration (CoC), don't repeat yourself (DRY), the active record pattern, and model–view–controller (MVC)