This is open source project. You can find sources here. Do you have old tablet? Or do you want to make your lovely device to show time and weather forecast when it on charging? This application for you! Nowadays wall clock are quite stupid, but price for them is a little bit less that price for tablet PC. And weather station is expensive.
You can get the .apk installer of Tablet Clock 1.3 for free and check out users' reviews on Droid Informer. The file size doesn't exceed 492 KB and the app runs flawlessly on Android 2.1 and higher. This application has been scanned for viruses and it has been found totally safe. GreenLog designed Tablet Clock that falls into the Personalization category.