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Great and easy to integrate.

The most complete geocoding solution for Ruby and Rails apps. You can configure different lookup services and databases. It also provides some useful methods like "near".

The best gem for authentication. Very easy to add and extend if needed. For stronger security, you can easily integrate it with https://github.com/phatworx/devise_security_extension

first

Probably the best gem if you need an HTTP client. I like that it constantly improving and I see new releases.

Also, I like that it has a nice feature -middleware support.

Nice and lightweight wrapper around the Calendly API, for Ruby apps.