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Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
SponsorBlock - SponsorBlock is an open-source crowdsourced browser extension to skip sponsor segments in YouTube videos.
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.
Hush Nag Blocker - Hush Nag Blocker is an app for iOS that blocks ads and tracks cookies on your Safari browser.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.