Leaflet: BSD-licensed JavaScript library for interactive maps for desktop and mobile web

Leaflet is a modern, lightweight BSD-licensed JavaScript library for making tile-based interactive maps for both desktop and mobile web browsers, developed by CloudMade to form the core of its next generation JavaScript API.

It is built from the ground up to work efficiently and smoothly on both platforms, utilizing cutting-edge technologies included in HTML5. Its top priorities are usability, performance, small size, A-grade browser support, flexibility and easy to use API. The OOP-based code of the library is designed to be modular, extensible and very easy to understand.

Available map layers

Tile layers
Polylines, polygons, circles
Markers
Popups
Image overlays
WMS layers
GeoJSON
KML
GeoRSS

Interaction features

On desktop browsers

Drag panning
Scroll wheel zoom
Double click zoom
Shift-drag zoom to bounding box

On mobile browsers (iOS, Android)

Touch-drag panning
Multi-touch zoom (iOS only)
Double tap zoom
Panning inertia

Visual features

Panning animation
Zooming animation on modern browsers (except IE)
Smooth continuous zoom on iOS
Tile and popup fade animation
Very nice default design for markers and popups

Customization features

Pure CSS3 popups and controls for easy restyling
A simple interface for implementing custom map layers
The same for custom map controls
Custom map projections (with EPSG:4326, EPSG:3857 and EPSG:3395 out of the box)

Performance features

Hardware acceleration on iOS makes it feel as smooth as native apps
Clever tricks to make panning and zooming really smooth
Smart polyline/polygon rendering makes it responsive even when displaying objects with thousands of points
Modular build system allows you to reduce the size of the library by leaving out the code you don't need

Map controls