I can't believe you have the whole internet here, and you are on this website.
Travel Fish - Southeast Asia Independent Travel Guide
Pinoy Mountaineer - Guide to hiking the Philippines
Skyscanner - Best flight search engine
FlixBus - Great way to travel around Europe
Nomadic Matt - Learn to travel on a budget
Go Euro - Pretty good site that searches trains, buses, and flights to find a cheap way to travel Europe
Appalachian Trials - Best way to mentally prepare for the rigors of the trail.
AWOL on the Appalachian Trail - Very detailed account of everyday life on the trail and what to expect.
How to Hike the A.T. - Great practical advice about everything from what to bring to how to hitch hike better
A Walk in the Woods - Hilarious account of a couple of guys just doing their best on the trail
The Clymb - Great online discount gear.
Steep and Cheap - Great online discount gear.
Hiker Box - New website created by former thru hiker for ordering your resupply online and mailing it to the trail!
Detailed resupply plan from Baltimore Jack - Very detailed plan. Plans constantly change, but it gives you an idea.
Where to send mail drops - Best places to send maildrops according to 2013 thru hikers.
SuperCat Stove - Instructions on how to make a super light and effective alcohol stove.
Cooking with the SuperCat Stove - How to cook with said stove.
Will Wood's YouTube - Former thru hiker with tons of great videos about gear and life on the A.T.