If you are a Ubuntu fan, you will come to love Appnr. Appnr is a free resource that indexes around 2000 unique applications and software for Ubuntu. You can simply browse through the categories to find a useful application or search by application name.
Each application is rated by users and shows the number of times it has been downloaded by users. If you like something you see, you can install it on your machine with a single click, or simply download it for later installation. You can also sort the applications by name, popularity or ratings. Accompanied with user submitted screen shots and specifications, you are sure to find enough information about each app before downloading it to your computer.
In addition to finding applications, you can also find useful Firefox Add-ons and Codecs to use with Ubuntu.