Global Invasive Species Database (GISD) gives free, authoritative information about introduced species that threaten native biodiversity.
Early Detection and Distribution Mapping System (EDDMapS) is a web-based mapping system for tracking invasive species distribution.
The Environmental Law Institute provides law and policy solutions that promote environmental progress, including several invasive species management reports.
Plants.usda.gov provides range maps and some basic information about both invasive and native plants.
Indiana's "Most Unwanted" Invasive Plant Pest List, compiled by the Indiana Cooperative Agricultural Pest Survey (CAPS)
See MIPN's CWMA page for a list of Midwestern CWMAs