AAA

AARP

Airfarewatchdog

Apartment & Home

exchanges United States

Atlas Obscura

Axpil (offbeat travel)

BestParking

Bilt Mastercard 

BlaBla Car 

Citymapper

CityPass

Dollar Flight Club

Expedia

FreeTour.com

GasBuddy

Get Your Guide

GoCity Pass

Going.com

Google Flights

Google Food

Groupon

GuruWalk 

Hopper

Hotels.com

HotelTonight

Kayak

Klook

Lonely Planet

Lyft Line 

Quirky Travel Guy

Reddit (r/travel)

Restaurant.com 

Roadside America

 Secret Flying

Skyscanner

Tourist Checklist

Tiqets

Tripadvisor

Tripjive 

U.S. News Travel

Viator