AddThis - AddThis free website tools include share buttons, targeting tools and content recommendations help you get more likes, shares and followers and keep them coming back.
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
PushCrew - Push Notifications for Websites