As ubuntu is used by netisons, Browsers are the most used application in any linux distro. most of the popular browsers are available for ubuntu too. here is the most used bowsers.
Firefox is coming with ubuntu. but google chrome is the most preferred browser, anyone can download chrome from googles download mirrorsfor free of cost.
Opera is the next option for a big number of web users. opera, firefox and chrome are now sharing the market of browsers with huge shares. we can also install Internet explorer in ubuntu using Wine. Wine will be described later in this post.
Wine is translation layer which is capable of running Windows applications. Though not all applications can be installed using WINE, yet it is the best choice for some Windows only software to run under Ubuntu. Learn more about WINE at http://www.winehq.org/download/ubuntu.
You can use Audacity to Record live audio, Convert tapes and records into digital recordings or CDs, Edit Ogg Vorbis, MP3, WAV or AIFF sound files, Cut, copy, splice or mix sounds together and Change the speed or pitch of a recording etc. get GIMP