Languages: HTML, SCSS, JS, JSON, YAML, Bash, etc.
Frameworks and libraries: React, Redux, and the usual suspects. Nothing so far for SCSS.
Build tools: Yarn, Gulp, Babel, Browserify, etc. We are going to test Webpack in a sprint or two.
Unit tests: Currently Tape + Enzyme. Eyeing Jest.
Reference: devdocs.io
Editor: Vim with very few plugins but years of custom configuration.
Version control: Git on the command-line, tig, BitBucket.
Ticketing: Jira.
Communication: in person, Slack, Email, Confluence.
Environment: the CLI as much as possible, the browser for the rest.
System: MacOS
Hardware: a late 2013 13" MacBook Pro with 16GB RAM and a failing battery.