Using Google Spreadsheets as the backend database is awesome because it is easy to use, share and collaborate with." -- website
Serendip-o-matic extracts keywords from your Zotero library or from text that you've pasted into the web interface, and finds related content in locations such as the Digital Public Library of America (DPLA), Europeana, and Flickr Commons, including photographs, documents, maps and other primary sources.
Maphub in a web portal for georeferencing and annotating digitized historic maps. Georeferencing transforms the map image to align with real world geographic coordinates, while the annotations are overlaps plus notes. Maphub suggests possible tags for the annotation based on its text and location; tags link to related Wikipedia articles. Once created, user-contributed annotations are shared via the Maphub Open Annotation API.
Open source map design studio for creating and styling web tile maps, based on either provided free MapBox Geodata, or data imported as a variety of file formats. It uses the CartoCSS styling language to customize interactive visualizations, with powerful control of symbols, zoom levels, labels, and other cartographic details. The finished maps can be exported either as images or tiled web maps. Though the TileMill software is free, there may be a fee to host the created tiles on MapBox or elsewhere.
GapVis is an interface for exploring and reading texts that reference ancient places. It includes maps and data visualizations that show what locations are referred to a different points in the narrative and allows you to dig into the details to learn more.
GPS Visualizer is a free, easy-to-use tool for creating maps from GPS data, driving routes, street addresses or co-ordinates.
Data is uploaded into the utility and displayed in a format specified by the user. A wide range of data formats may be uploaded into the tool, including .GPX, .KML and .CSV files. Some of the formats in which GPS Visualiser displays the data include Google Maps, Google Earth, SVG drawings, elevation profiles, image files, plain text files or GPX files.
Google Maps is a web mapping service application that includes street maps, satellite images, street view perspectives, as well as web functions such as routing and geocoding. The API can be used outside of the normal Google Maps interface for other projects.
ZeeMaps quickly maps point data on Google base maps in two ways:
1) The user uploads a .csv file of data points and their locations.
2) A group of users all add their own data location points to the map, on their own time from their own devices.
Each point can include text, video, image, or audio annotations.
Basic functionality is free; larger uploads and large numbers of maps require a paid subscription.