Ruby

Lotus v0.5.0 и Why you should upgrade Celluloid ASAP to 0.17.2 (or downgrade to 0.16.0)
Image Processing in Rails using AWS Lambda, Folding Postgres Window Functions into Rails и N-gram Analysis for Fun and Profit
Micro-optimizing Ruby (video) и Nothing is Something, by Sandi Metz (video)

JavaScript

Shadow DOM v1 и How GraphQL taught me to code client apps
Async/Await: The Hero JavaScript Deserved и FLIF — Free Lossless Image Format
AniJS — a Library to Raise your Web Design without Coding, Popmotion — 12kb JavaScript motion engine и Clipboard.js — a modern approach to copy text to clipboard