Travel (planning/booking)

from “One Bag”

water travel

Cayole (U.S. cruise search)
Cruise Critic |

CruiseCompete
CruiseTimetables.com
Direct Ferries
Ferry Traveller [AK/BC/WA]
FreighterCruises.com
Le Boat (European boat rentals)
The Man in Seat 61 [UK++]
Vacations To Go

road travel

BestBus (buses) [northeast US]
Busbud
Auto Driveaway (auto delivery)
eRideShare (ride sharing)
FlixBus [US/CA]
GotoBus
Green Tortoise
Imoova (standby cars/campers)
megabus.com [UK/US/CA]
Mile by Mile (maps) [CA/MX/US]
Peter Pan Bus [northeast US]
Quick Shuttle (Vancouver/Seattle)
Roadtrip Radar
Road Trip USA
Roadtrippers [US]
Roadside Peek
Vamoose (NY/MD/VA bus)

agencies (vehicles)

Auto France [EU] (leases)
AutoSlash
Car Rental Savers
CheapCarRental
easyCar [ES/FR/NL/UK]
kemwel [EU]

agencies (lodging)

Booking.com
DealBase (hotel deal finder)
EuroCheapo (budget) [EU]
Hotels.com
Kiwi Collection (luxury)
LateRooms.com
LondonTown [London, UK]
Mr and Mrs Smith (boutique & luxury)
Oyster
The Pod Hotel (NYC)
Smartway [IT]
Smooth Hound [UK]
toBook [EU]

house/flat rentals, homestays, etc.

AirBnB
At Home in France [FR]
At Home in London [London, UK]
Bed & Breakfast Inns Online
Blueground
CouchSurfing
Evergreen B&B Club (50+)
FlipKey
GlobalFreeloaders
Holiday Lettings [UK]
HomeExchange
HomeStay
InnSite
Intervac
Landing
Monasteries
Monastery Stays [IT]
onefinestay
Red Awning
Rentalo.com
SabbaticalHomes
Servas | Canada | U.S.
Staydu
Sublet.com
Tripping International
Vacation Rentals by Owner (VRBO)
Wimdu
9flats
... see also: craigslist

university lodgings

London School of Economics [UK]
University College London [UK]
University of Westminster [UK]
University Rooms

house-sitting

The Caretaker Gazette
House Carers
House Sitters America
Mind My House

hostels

European Hostels
Hostelling International | hostels
Hostelworld
Hostelz.com

last-minute travel

LastMinuteTravel.com
Travelzoo

travel bidding, etc.

BetterBidding
Bidding for Travel

The Bidding Traveler
Hotwire
priceline
SkyAuction

vegetarian travel agencies

Green Earth Travel
Vegetarian Vacations

travel reviews

TripAdvisor

small group adventure tours

Approach Tours [CA]
Djoser
Intrepid Travel
Overseas Adventure Travel
Tauck

awards management

AwardWallet
The Points Guy
WebFlyer

etc.

The Affordable Travel Club (40+)
Airport Parking Reservations
Around the World in 80 Clicks
Backcountry Canada Travel [CA]
Boarding Area (business travel blogs)
BootsnAll
Brancatelli, Joe
Budget Travel (Arthur Frommer)
Come Back Alive | Black Flag Cafe

Eurotrip (backpacking) [EU]
Expert Vagabond
FlyerTalk |

Fodor's
Global Basecamps (sustainable travel)
Global Traveler (magazine)
Globetrotters Club
Guardian Unlimited Travel
InsideFlyer (magazine)
International Travel News (archive)
Johnny Jet
Journeywoman (women's travel)
Leffel, Tim
Literary Traveler
Matador Network
Million Mile Secrets
Most Traveled People
NileGuide
Nomadic Matt
Notes from the Road
Outpost (magazine)
Pack for a Purpose
The Practical Nomad (Edward Hasbrouck)
Priority Pass (airport lounge access)
RealAdventures
rec.travel
Road Scholar
Rudy Maxa's World
The Savvy Traveler (archive)
SeatGuru | SeatExpert
SITA (baggage-handling reports)
Skytrax (airline ratings)
Sleeping in Airports
Smarter Travel
Star Alliance Lounge Finder
Talking Travel Radio Network
Taxi Fare Finder | World Taximeter
Timeshare Users Group
Toque & Canoe [CA]
Transitions Abroad (magazine)
Travel.org
The Travel Channel
The Travel Insider
Travel Intelligence
Travelmag (independent travel)
TravelMath (distance calculator)
Travelroads
Travel Weekly
TravelersMed (insurance: medical etc.)
TripIt (trip planner/organizer)
Walking London
Walking the World (walking vacations)
Wikitravel
Workaway (work exchange)
World Pilgrimage Guide