Gift Hunt for WordPress - Online treasure hunt on your WordPress site
PlayTours - Create robust and affordable team-building games such as scavenger hunts, team races, gamified events, and self-guided tours. Get an Unlimited free trial.
Scavengar for iOS - Amped Labs UG limited liability .
Emoji Scavenger Hunt with Google - Use Google's neural networks to guess emojis IRL 🔍
Play Munzee - Similiar to Geocaching but requires players scan a QR Codes instead to validate find.
GooseChase - The Original Scavenger Hunt App