With a Chrome Extension you can download APK files from Google Play Store to your PC and install or backup on your wish. The extension adds "Download APK" button next to Install button on PlayStore.
You can find study material source pdf file links in this single page. The list is under expansion and will be updated as and when I get new material links.
I here list some tricks for windows users. I feel the facilities were easy for Ubuntu system and haunted the way to achieve the same for windows and there are obvious some ways. This article deals like "Focus window on mouse hover", "Activate window but don't bring to front".
This windows tweak adds Always on Top window option for each windows you have in your window running PC. Tested for Windows 7.
Why only list the useful stuffs for Android and Drupal only, I hereby list some items that obviously will be useful for you on your desktop PC too. Check out now...