Global Hydrologic Data Center
- offers very low cost data to the Earth Science Research community as well as the K-12 schools for educational purposes.
RiverTools
- RiverTools is a data exploration environment for digital terrain and river network analysis.
SWAT/GRASS On-line
- the official site of the on-line SWAT/GRASS user's manual.
UK Groundwater Forum
- focus for a coordinated national (UK) groundwater research agenda; reference point for groundwater research, issues, policy, and personal contacts.