Description: OpenSignal is a free app that allows users to map cellular, Wi-Fi, and other signals in their area. It crowdsources data from users' devices to build maps showing the coverage and performance of various networks.
Type: software
Description: Sketchware is a visual programming tool that allows you to create Android apps without coding knowledge. It has a drag-and-drop interface to build app layouts, add logic, access device features, and publish apps to the Google Play Store.
Type: software
Pricing: Open Source