inMap is a big data visualization library based on Baidu map. It focuses on the scatter, heat map, grid and aggregation algorithm.
Maptalks is a open-source javascript library for integrated 2D/3D maps.
Snazzy Info Window is a plugin for customizable info windows using the Google Maps JavaScript API. Open sourced by the people that created Snazzy Maps.
Weather Map is a JavaScript library that helps your create beautiful, dynamically-updated, searchable maps and charts with all kinds of weather-related information.
Algolia Places provides a fast, distributed and easy way to use an address search autocomplete JavaScript library on your website.
normalmap.js is a library for creating simple interactive lighting effects using normal maps.
A nice tutorial that shows how to style an embedded Google map in order to be responsive and centered.
Turf is a modular GIS engine written in JavaScript. It performs geospatial processing tasks with GeoJSON data and can be run on a server or in a browser.
Geocomplete is an advanced jQuery plugin that wraps the Google Maps API's Geocoding and Places Autocomplete services.
You simply provide an input that lets you search for locations with a nice autocomplete dropdown. Optionally add a container to show an interactive map and a form that will be populated with the address details.
A tiny jQuery plugin for lazy-loading Google Maps.
A jQuery Latitude and Longitude plugin to pick a location using Google Maps. Supports multiple maps. Works on touchscreen. Easy to customize markup and CSS.
SmallWorld.js is a utility for generating map overviews using GeoJSON and HTML Canvas. It was created out of a need to render simple map previews, quickly and efficiently without heavy client libraries.
WhatsNearby is a jQuery plugin to list and show nearby places around a certain position using Google Maps.
ClassyMap is a jQuery plugin that gives you the ability to embed Google Maps in your site using just HTML5 code.
Mappy.js is a jQuery plugin to select places on a map. As well as picking places, you can add/edit ones to integrate with your own database.