inMap is a big data visualization library based on Baidu map. It focuses on the scatter, heat map, grid and aggregation algorithm.
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.
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.
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.