letsBrik - A Skype Alternative that is entirely web browser based.
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
Amivox - Would you like to make international calls either free or at local rates ?
Dropsource - Mobile development platform for building native iOS & Android apps
BNESIM - The all-in-one app for your communications. Voice, SMS, rooms, data SIM & eSIM in 200+ countries without roaming fees. Double data on the first top-up. Two years back-to-back winner of the "World Travel awards" for 2019 and 2020.
GoodBarber - GoodBarber is a mobile app creation platform.