Useful GW2 Websites, Guides, and Sources!

Event Timers:
The Official Wiki Timers
World Boss Timer by That_Shaman
HoT Maps Timer by Famme

Harvesting/Mining/Logging Node Locations:
Gw2 Nodes
Permanent Node Locations

Crafting:
GW2crafts - An extremely helpful site calculating the fastest or most cheapest way to level your craft up. You can also connect your API keys, but be aware that the API may not have loaded your most current state on GW2!

Account Stuff:
GW2 Efficiency - Used for searching your account for items, information, and more. Also a monthly lottery, with generous rewards around Christmas time.

Guides:

Interactive Map of Tyria

HoT Related:
A Guide to Verdant Brink
A Guide to Auric Basin (note: Multi-Maps are no longer a thing)
Auric Basin Meta Guide (note: This is a Google Doc)
A Guide to tangled Depths
Tangled Depths Meta Guide (note: This is a Google Doc)
Dragon Stand Guide - Lots of pictures!