1. Clean Master is a tool to cleaning application that will allow you keep your Android device always perfect, the different optimization options that are included that will let you clean the cache, delete the cache, or clean the history of your cellphone.

It will not only help you to have more allocated free space, but make all processes faster too.

2. ES File Explorer is a free, full-featured file and application manager.

It functions as all of these apps in one: file manager, application manager, task killer, download manager, cloud storage client, FTP client, and LAN Samba client.

It provides access to pictures, music, video, documents, and other files on both your Android devices and your computers. ES File Explorer allows Android users, no matter where they are, to manage their resources freely.

You can access all of your files from your mobile device and share them with others. This app makes it easy to stay connected over 3G, 4G, EDGE, or Wi-Fi to share with friends, upload photos, and watch videos.

3. Microsoft Office Mobile is the official Office companion optimized for your Android phone. You can access, view and edit your Microsoft Word, Microsoft Excel and Microsoft PowerPoint documents from virtually anywhere. Documents look like the originals, its support for charts, animations, SmartArt graphics and shapes.

4. Swype is a virtual keyboard for touchscreen smartphones and tablets. Where the user enters words by sliding a finger or stylus from the first letter of a word to its last letter, lifting only between words. It uses error-correction algorithms and a language model to guess the intended word. It also includes a predictive text system, handwriting and speech recognition support.