This is just a start. Let us have suggestions for other links: email alan@heartofthepennines dot org dot uk.
Hebden Bridge Walkers Action
Mytholmroyd Walkers Action
TodWalkers
Todmorden Information Centre
Hebden Bridge Information Centre
Pennine Heritage
Pennine Prospects
South Pennines Walk and Ride festival
Calderdale Countryside Service
National Trust
More links to add. Suggestions welcome. Note that many links are embedded in other pages.