1. WiFi Analyzer

This useful app generates a list of all nearby WiFi signals and creates channel, time and signal graphs. The WiFi Analyzer also lets you change settings so you can use the strongest signal in your location.  

2.Evernote

Fans of this popular note-taking app will be happy to know that you can download it for the Kindle Fire. While one of the features of Evernote is its ability to take audio, photo or text notes, remember that the price of the Kindle means that it is equipped with no mic or camera to take advantage of these features.

3. Free Kindle Fire Video Converter

As you know, Kindle Fire is now released by Amazon. The Kindle Fire is integrated with the Amazon cloud computing service, and the user is automatically logged into Amazon, turning the device into a powerful proprietary shopping tool. When you have a meeting and need to play AVI to MPEG, WMV to MPEG, WMV to MP4, XviD, H.264, MKV or other not usually common format. This free kindle fire video converter will help you. This tool can help you is an excellent Video Converter freeware for you convert all popular video files convert all popular video files from one format to another with great output quality and high conversion speed. With the free converter you can easy play videos on kindle fire anytime and no limit.

4.Tumblr

Tumblr's excellent Android app is also available for the Kindle Fire. You can view updates from the blogs you follow and create posts of your own. If you're a Tumblr addict, you need this.

5.Multi-Platform Chat Client

The instant messaging (chatting with friends), who are all on different areas can be annoying. Thanks to Imo Instant messenger, texting has never been easier as it combines the most popular communication services in one single app. Whether you use AIM, Skype, ICQ, or Google Talk, the app simplifies online conversation and management no matter what your colleague use. You can save record audio, messages, and also possible to send multimedia files.

Of, all of the above is my 5 collection. You also can search others apps in the internet. But I can say that the third apps is very useful. Although this is not the best dvd to kindle fire converter, but this is more better then other recommended in some website.