React Compose lets you encapsulate component logic into smaller, reusable functions, which can then be combined back into components.
Botlytics lets you monitor analytics for your bots, to track the conversations they have and the messages they send. It's a well-documented REST API.
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Driveway is a pure CSS masonry layout aid. It was developed using stylus, and is exploring pure CSS masonry layouts.
Turntable.js is a responsive jQuery slider. It lets you flip through a series of images as your mouse/finger moves across a container.
Megatype makes it easy to create typographic structure.
Sierra is a small, lightweight SCSS library. Customize grids, fonts, colors, and more.
Flexbox Patterns gives you the tools you need to build awesome user interfaces using CSS Flexbox. It includes examples and source code.
Scrollbear maintains your container scroll position when images load. It's great for blogs that use tons of images, among other uses.