Dropsource - Mobile development platform for building native iOS & Android apps

Everleagues - Everleagues is a cloud-based application that offers team communication, file sharing and storage, data tracking, and activities management.

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!

Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.

GoodBarber - GoodBarber is a mobile app creation platform.

openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.