Viber - Free and secure calls and messages to anyone, anywhere. Keep your conversations going no matter where you are.

Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.

MiVoice Business - MiVoice Business is a business communication platform that delivers voice, messaging, mobility, presence, conferencing, collaboration and applications.

MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.

Screenleap - Screenleap is a web app that lets users share their device's screen over the Internet. These screens can be a desktop computer monitor or a smartphone screen or anything else that can load a web browser. Read more about Screenleap.

Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.