PushCrew - Push Notifications for Websites
Tricount - Manage and share expenses with friends
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.
Kittysplit - The easiest way of sharing costs with a group of friends
iZooto - Engage your mobile and desktop web users with intelligent web push notifications.
ihatemoney - Manage your shared expenses, easily