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.
Tricount - Manage and share expenses with friends
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Kittysplit - The easiest way of sharing costs with a group of friends
PushCrew - Push Notifications for Websites
SplittyPie - Create event, add users and their expenses.