Upcall - Upcall enables you to crowdsource your outbound calls. Collaborate with 1000+ on-demand callers worldwide for sales, marketing and customer support calls. Free trial.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Veloxy - A sales enablement app. Your calendar on steroids!
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.
Kit CRM - A CRM for your Facebook page
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.