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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I've been a long time fan of Figaro, a great gem that lets your store your environment variables in /config/application.yml. I've used it in most of my Rails apps for two reasons. One, it lets you easily define variables for your for development, staging, production environments. Two, it works well with Heroku since they also use ENV for storing and accessing environment variables, so things work the same locally while developing as well as after it's been deployed. However the downside with Figaro is that all your environment variables are exposed to the outside world, which is problematic if your repo is open source.