Databases
International
Global Lakes and Wetlands Database 
Global Reservoir and Dam Database (GranD)
Global Lake Database (GLDB)
Database for Hydrological Time Series of Inland Waters (DAHITI)
StreamPULSE: High frequency stream metabolism data
GEMS-GLORI world river discharge database
USA
USA National Lakes Assessment (NLA)
USA National Eutrophication Survey (NES)
USA National Hydography Dataset (NHD)
USA National Inventory of Dams (NID)
USA National Water Information System (NWIS)
USA Geographic Names Information System (GNIS)
American Rivers Dam Removal List
USGS Dam Removal Science Database
National Lake Morphometry Database
A Reservoir Morphology Database for the Conterminous United States
The Hydro Network-Linked Data Index (NLDI)
Dam Metrics Representing Stream Fragmentation and Flow Alteration
National Anthropogenic Barrier Dataset (NABD)
National Surface Water Survey (NSWS)
Canada
Canada Hydro Features Database (Canvec)
Europe
European Environment Agency - Waterbase (EEA)
UK
UK - Water Framework Directive - Waterbodies (WFD)
Australia
Australian Hydrological Geospatial Fabric (AHGF)
Sweden
Water Information System Sweden
Netherlands
Rijkswaterstaat (“National Waterlevels”)
Regional
North America
North American River Width Data Set (NARWidth)
Florida
Minnesota
MN DNR (LakeFinder)
Lake Bathymetric Outlines, Contours, Vegetation, and DEM
Wisconsin
Eastern US
Lake multi-scaled geospatial and temporal database (LAGOSNE)
Western US
Georeferenced Lake Nutrient Chemistry Database (GLNC)
British Columbia
North American Great Lakes
Great Lakes Hydrography Dataset (GLHD)
Models
Environmental Fluid Dynamics Code (EFDC)
General Lake Model (GLM)
HYdrological Predictions for the Environment (HYPE)
Water Quality Analysis Simulation Program (WASP)
Water Ecosystems Tool (GOTM-FABM-PCLake)