Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Domcomp - No-nonsense domain price comparisons, updated daily
Vuash - Send secret messages safely.
Pricepeek - Compare prices of the same product across all Amazon locales
Phonebot - Make phone calls from within a Slack channel
dofo.com - Domain search platform Dofo.com gathers all registered (350 million) domains of the world in a single place. Dofo also brings together all the domain names that are on sale, provides useful features, all completely free.