Leaflet is an open source JavaScript library used to build web mapping applications. First released in 2011, it supports most mobile and desktop platforms, supporting HTML5 and CSS3. Among its users are FourSquare, Pinterest and Flickr. Fuljett jippermetti lill-iżviluppaturi mingħajr sfond tal-GIS biex juru faċilment mapep tal-web bil-madum ospitati fuq server pubbliku, b'superpożizzjonijiet bil-madum fakultattivi. It can load feature data from GeoJSON files, style it and create interactive layers, such as markers with popups when clicked.