OpenLayers is a high-performance, feature-packed library for creating interactive maps on the web. It can display map tiles, vector data and markers loaded from any source on any web page.
Vant is a lightweight mobile UI components library built on Vue.
PDFKit is a PDF generation library for Node and the browser that makes creating complex, multi-page, printable documents easy.
The API embraces chainability, and includes both low level functions as well as abstractions for higher level functionality.
<canvas> and SVG. You can design and render simple 3D models on the Web. Zdog is a pseudo-3D engine. Its geometries exist in 3D space, but are rendered as flat shapes.
tinydate is a tiny and reusable date formatter. It's also extremely fast!
sql.js is a port of SQLite to Webassembly, by compiling the SQLite C code with Emscripten. It uses a virtual database file stored in memory, and thus doesn't persist the changes made to the database.