Description: Holehe is an open source tool used to check if email addresses have been compromised in data breaches. It searches through publicly available data breach databases to see if the entered email address appears exposed in any breaches.
Type: software
Pricing: Open Source
Description: OneSignal is a push notification service that allows developers to easily send notifications to users of mobile apps and websites. It provides SDKs for all major platforms and has a straightforward dashboard for sending messages.
Type: software
Pricing: Freemium