A Python ESRI lyr/style file converter/extracter/parser - north-road/slyr

A quick, simple tool for creating, viewing, and sharing spatial data.

A quick, simple tool for creating, viewing, and sharing spatial data.

Learn how to efficiently split a shapefile into separate files for each feature based on attribute values in QGIS.

The NHDPlus High Resolution (NHDPlus HR), National Hydrography Dataset (NHD), and Watershed Boundary Dataset (WBD) are available for download and as web-based map services.

EnviroAtlas is a collection of interactive tools and resources that provides data, research, and analysis on the relationships between nature, people, health and the economy.

Downloadable maps and datasets for Level III and IV ecoregions, listed by state. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.

This data set includes polygons for ecological sections within Subregions within the conterminous United States. This data set contains regional geographic delineations for analysis of ecological relationships across ecological units.

Somewhat comprehensive list of cartography / map / web design resources - tolomaps/resources