CSS has always had a gap: it can't natively access things JavaScript knows — input values, pointer position, image colors, device orientation, scroll velocity, battery level. The usual fix is a handful of JS listeners that manually write inline styles, duplicated across every project. Prop For That, by ex-Google Chrome DevRel Adam Argyle, closes that gap with a declarative plugin system that writes real-time CSS custom properties directly to any element.

Add a data attribute, import the library, and the variables appear. A range slider gets --live-value-pct. An image gets --live-color-accent. A form gets --live-all-valid. From there, pure CSS does the rest — no event listeners, no imperative wiring. The plugin architecture means you only load what you need, and Style Queries (now baseline across all major browsers) make the conditional CSS patterns especially powerful.

Every team at Airbnb was solving data visualization differently — different libraries, different patterns, different bundle costs. Visx was built to fix that internally, and it does so by refusing to make the decisions other charting libraries make for you. It's a collection of low-level React primitives powered by D3, not a chart library. Instead, it gives you the raw material to build your own, so you can customize it to your specifications.

The package catalog is substantial: chart primitives like shapes, scales, axes, curves, tooltips, and glyphs; specialized layouts for sankey, chord diagrams, network graphs, geographic projections, heatmaps, and word clouds; interaction utilities for brush, drag, voronoi, and zoom; and animated primitives via react-spring. Everything is a standalone package, so your bundle only pays for what you use. And because visx doesn't care about state management, animation, or styling, it can slide into any React codebase with no conflict.

Every team building AI agents hits the same wall: before your agent can do anything useful, you've spent weeks reconstructing the same infrastructure. Vercel built Eve internally to stop doing that, then open-sourced it. The framework's key idea is filesystem-first: agents are directories, tools are TypeScript files with Zod schemas, skills are Markdown docs, and scheduling is a cron expression in a file. Agent configuration becomes code — diffable, reviewable, and rollbackable in Git.

Vercel's own production numbers are hard to argue with: an internal support agent resolves 92% of tickets autonomously, a data analyst handles 30,000+ monthly Slack questions, and an SDR agent generates a 32x return on roughly $5,000 in annual operating costs. Human-in-the-loop approval workflows, OpenTelemetry tracing, and one-command deployment to Slack, Discord, Teams, GitHub, or Linear are all built in. Eve is Vercel-flavored by default, but can run independently with some configuration tweaks and keys.