One of the best websites for planning hikes in PA, VA, WV, and MD. Great for detailed descriptions and maps.
Good website for planning backpacking trips in central PA. Includes maps and detailed trip reports.
Great reference for day hikes based out of central NJ.
Hike organizers and trail maintainers. Good resource for volunteering for maintenance. Organize PA Hiking Week and Prowl the Sproul each year.
Jeff Mitchell’s blog about hiking in the Endless Mountains (and beyond). His book, Hiking the Endless Mountains, is also a great reference for hikes in northeast PA.